13172151555 has 28 divisors (see below), whose sum is σ = 23699038080. Its totient is φ = 7025145552.

The previous prime is 13172151523. The next prime is 13172151557. The reversal of 13172151555 is 55515127131.

13172151555 is a `hidden beast` number, since 1 + 31 + 7 + 21 + 51 + 555 = 666.

It is not a de Polignac number, because 13172151555 - 2⁵ = 13172151523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13172151557) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1803235 + ... + 1810524.

Almost surely, 2^13172151555 is an apocalyptic number.

13172151555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13172151555 is a deficient number, since it is larger than the sum of its proper divisors (10526886525).

13172151555 is an frugal number, since it uses more digits than its factorization.

13172151555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613782 (or 3613767 counting only the distinct ones).

The product of its digits is 26250, while the sum is 36.

Adding to 13172151555 its reverse (55515127131), we get a palindrome (68687278686).

The spelling of 13172151555 in words is "thirteen billion, one hundred seventy-two million, one hundred fifty-one thousand, five hundred fifty-five".