264563021555 has 16 divisors (see below), whose sum is σ = 362852613120. Its totient is φ = 181402980192.

The previous prime is 264563021537. The next prime is 264563021563. The reversal of 264563021555 is 555120365462.

It is not a de Polignac number, because 264563021555 - 2¹⁰ = 264563020531 is a prime.

It is a super-2 number, since 2×264563021555² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328106 + ... + 797984.

It is an arithmetic number, because the mean of its divisors is an integer number (22678288320).

Almost surely, 2^264563021555 is an apocalyptic number.

264563021555 is a deficient number, since it is larger than the sum of its proper divisors (98289591565).

264563021555 is a wasteful number, since it uses less digits than its factorization.

264563021555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485978.

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 264563021555 in words is "two hundred sixty-four billion, five hundred sixty-three million, twenty-one thousand, five hundred fifty-five".