155172996 has 144 divisors (see below), whose sum is σ = 463776768. Its totient is φ = 44906400.

The previous prime is 155172947. The next prime is 155173001. The reversal of 155172996 is 699271551.

155172996 is a `hidden beast` number, since 1 + 551 + 7 + 2 + 9 + 96 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 245601 + ... + 246231.

It is an arithmetic number, because the mean of its divisors is an integer number (3220672).

Almost surely, 2^155172996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155172996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231888384).

155172996 is an abundant number, since it is smaller than the sum of its proper divisors (308603772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155172996 is a wasteful number, since it uses less digits than its factorization.

155172996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 670 counting only the distinct ones).

The product of its digits is 170100, while the sum is 45.

The square root of 155172996 is about 12456.8453470371. The cubic root of 155172996 is about 537.3683063697.

It can be divided in two parts, 1551 and 72996, that added together give a palindrome (74547).

The spelling of 155172996 in words is "one hundred fifty-five million, one hundred seventy-two thousand, nine hundred ninety-six".