1555165160565 has 32 divisors (see below), whose sum is σ = 2534527065600. Its totient is φ = 814045915200.

The previous prime is 1555165160551. The next prime is 1555165160567. The reversal of 1555165160565 is 5650615615551.

It is not a de Polignac number, because 1555165160565 - 2⁵ = 1555165160533 is a prime.

It is a super-2 number, since 2×1555165160565² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555165160567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 871611 + ... + 1967240.

It is an arithmetic number, because the mean of its divisors is an integer number (79203970800).

Almost surely, 2^{1555165160565} is an apocalyptic number.

1555165160565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1555165160565 is a deficient number, since it is larger than the sum of its proper divisors (979361905035).

1555165160565 is a wasteful number, since it uses less digits than its factorization.

1555165160565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839537.

The product of its (nonzero) digits is 3375000, while the sum is 51.

The spelling of 1555165160565 in words is "one trillion, five hundred fifty-five billion, one hundred sixty-five million, one hundred sixty thousand, five hundred sixty-five".