653642434261 has 4 divisors (see below), whose sum is σ = 653644601932. Its totient is φ = 653640266592.

The previous prime is 653642434231. The next prime is 653642434297. The reversal of 653642434261 is 162434246356.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 601888914225 + 51753520036 = 775815^2 + 227494^2 .

It is a cyclic number.

It is not a de Polignac number, because 653642434261 - 2¹¹ = 653642432213 is a prime.

It is a super-2 number, since 2×653642434261² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653642434231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540846 + ... + 1264831.

It is an arithmetic number, because the mean of its divisors is an integer number (163411150483).

Almost surely, 2^653642434261 is an apocalyptic number.

It is an amenable number.

653642434261 is a deficient number, since it is larger than the sum of its proper divisors (2167671).

653642434261 is a wasteful number, since it uses less digits than its factorization.

653642434261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167670.

The product of its digits is 2488320, while the sum is 46.

The spelling of 653642434261 in words is "six hundred fifty-three billion, six hundred forty-two million, four hundred thirty-four thousand, two hundred sixty-one".