258865401665 has 32 divisors (see below), whose sum is σ = 335512025856. Its totient is φ = 190604010240.

The previous prime is 258865401643. The next prime is 258865401671. The reversal of 258865401665 is 566104568852.

It is not a de Polignac number, because 258865401665 - 2⁶ = 258865401601 is a prime.

It is a super-2 number, since 2×258865401665² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 258865401665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33367967 + ... + 33375723.

It is an arithmetic number, because the mean of its divisors is an integer number (10484750808).

Almost surely, 2^258865401665 is an apocalyptic number.

It is an amenable number.

258865401665 is a deficient number, since it is larger than the sum of its proper divisors (76646624191).

258865401665 is a wasteful number, since it uses less digits than its factorization.

258865401665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9209.

The product of its (nonzero) digits is 13824000, while the sum is 56.

The spelling of 258865401665 in words is "two hundred fifty-eight billion, eight hundred sixty-five million, four hundred one thousand, six hundred sixty-five".