265421137631 has 16 divisors (see below), whose sum is σ = 287051839200. Its totient is φ = 243965761920.

The previous prime is 265421137613. The next prime is 265421137637. The reversal of 265421137631 is 136731124562.

It is a cyclic number.

It is not a de Polignac number, because 265421137631 - 2⁶ = 265421137567 is a prime.

It is a super-2 number, since 2×265421137631² (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 (265421137637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3285716 + ... + 3365526.

It is an arithmetic number, because the mean of its divisors is an integer number (17940739950).

Almost surely, 2^265421137631 is an apocalyptic number.

265421137631 is a deficient number, since it is larger than the sum of its proper divisors (21630701569).

265421137631 is a wasteful number, since it uses less digits than its factorization.

265421137631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80906.

The product of its digits is 181440, while the sum is 41.

The spelling of 265421137631 in words is "two hundred sixty-five billion, four hundred twenty-one million, one hundred thirty-seven thousand, six hundred thirty-one".