264555995591 has 4 divisors (see below), whose sum is σ = 271706157672. Its totient is φ = 257405833512.

The previous prime is 264555995567. The next prime is 264555995603. The reversal of 264555995591 is 195599555462.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264555995591 is a prime.

It is a super-2 number, since 2×264555995591² (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 (264555995791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3575080985 + ... + 3575081058.

It is an arithmetic number, because the mean of its divisors is an integer number (67926539418).

Almost surely, 2^264555995591 is an apocalyptic number.

264555995591 is a deficient number, since it is larger than the sum of its proper divisors (7150162081).

264555995591 is an equidigital number, since it uses as much as digits as its factorization.

264555995591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7150162080.

The product of its digits is 109350000, while the sum is 65.

The spelling of 264555995591 in words is "two hundred sixty-four billion, five hundred fifty-five million, nine hundred ninety-five thousand, five hundred ninety-one".