240644264620369 has 3 divisors (see below), whose sum is σ = 240644280133083. Its totient is φ = 240644249107656.

The previous prime is 240644264620349. The next prime is 240644264620399. The reversal of 240644264620369 is 963026462446042.

It is a happy number.

The square root of 240644264620369 is 15512713.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 72954403582225 + 167689861038144 = 8541335^2 + 12949512^2 .

It is not a de Polignac number, because 240644264620369 - 2²⁹ = 240643727749457 is a prime.

It is a super-2 number, since 2×240644264620369² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240644264620349) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7756357 + ... + 23269069.

It is an arithmetic number, because the mean of its divisors is an integer number (80214760044361).

Almost surely, 2^{240644264620369} is an apocalyptic number.

240644264620369 is the 15512713-rd square number.

240644264620369 is the 7756357-th centered octagonal number.

It is an amenable number.

240644264620369 is a deficient number, since it is larger than the sum of its proper divisors (15512714).

240644264620369 is an frugal number, since it uses more digits than its factorization.

240644264620369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31025426 (or 15512713 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 58.

The spelling of 240644264620369 in words is "two hundred forty trillion, six hundred forty-four billion, two hundred sixty-four million, six hundred twenty thousand, three hundred sixty-nine".