264155681 has 16 divisors (see below), whose sum is σ = 279172608. Its totient is φ = 249609600.

The previous prime is 264155677. The next prime is 264155687. The reversal of 264155681 is 186551462.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 264155681 - 2² = 264155677 is a prime.

It is a super-2 number, since 2×264155681² = 139556447609147522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (264155687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307805 + ... + 308661.

It is an arithmetic number, because the mean of its divisors is an integer number (17448288).

Almost surely, 2^264155681 is an apocalyptic number.

It is an amenable number.

264155681 is a deficient number, since it is larger than the sum of its proper divisors (15016927).

264155681 is a wasteful number, since it uses less digits than its factorization.

264155681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112.

The product of its digits is 57600, while the sum is 38.

The square root of 264155681 is about 16252.8668548044. The cubic root of 264155681 is about 641.6329402487.

The spelling of 264155681 in words is "two hundred sixty-four million, one hundred fifty-five thousand, six hundred eighty-one".