155551000665 has 16 divisors (see below), whose sum is σ = 256910040576. Its totient is φ = 80284387200.

The previous prime is 155551000639. The next prime is 155551000667. The reversal of 155551000665 is 566000155551.

It is not a de Polignac number, because 155551000665 - 2⁶ = 155551000601 is a prime.

It is a super-2 number, since 2×155551000665² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155551000667) 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, 167258676 + ... + 167259605.

It is an arithmetic number, because the mean of its divisors is an integer number (16056877536).

Almost surely, 2^155551000665 is an apocalyptic number.

155551000665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155551000665 is a deficient number, since it is larger than the sum of its proper divisors (101359039911).

155551000665 is a wasteful number, since it uses less digits than its factorization.

155551000665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334518320.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 155551000665 in words is "one hundred fifty-five billion, five hundred fifty-one million, six hundred sixty-five", and thus it is an aban number.