523740664649 has 4 divisors (see below), whose sum is σ = 533622564036. Its totient is φ = 513858765264.

The previous prime is 523740664637. The next prime is 523740664661. The reversal of 523740664649 is 946466047325.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (523740664637) and next prime (523740664661).

It can be written as a sum of positive squares in 2 ways, for example, as 128527269049 + 395213395600 = 358507^2 + 628660^2 .

It is a cyclic number.

It is not a de Polignac number, because 523740664649 - 2²⁴ = 523723887433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 523740664594 and 523740664603.

It is not an unprimeable number, because it can be changed into a prime (523740664849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4940949614 + ... + 4940949719.

It is an arithmetic number, because the mean of its divisors is an integer number (133405641009).

Almost surely, 2^523740664649 is an apocalyptic number.

It is an amenable number.

523740664649 is a deficient number, since it is larger than the sum of its proper divisors (9881899387).

523740664649 is an equidigital number, since it uses as much as digits as its factorization.

523740664649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9881899386.

The product of its (nonzero) digits is 26127360, while the sum is 56.

The spelling of 523740664649 in words is "five hundred twenty-three billion, seven hundred forty million, six hundred sixty-four thousand, six hundred forty-nine".