55172152020 has 24 divisors (see below), whose sum is σ = 154482025824. Its totient is φ = 14712573856.

The previous prime is 55172152003. The next prime is 55172152033. The reversal of 55172152020 is 2025127155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459767874 + ... + 459767993.

It is an arithmetic number, because the mean of its divisors is an integer number (6436751076).

Almost surely, 2^55172152020 is an apocalyptic number.

It is an amenable number.

55172152020 is an abundant number, since it is smaller than the sum of its proper divisors (99309873804).

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

55172152020 is a wasteful number, since it uses less digits than its factorization.

55172152020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919535879 (or 919535877 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 30.

Adding to 55172152020 its reverse (2025127155), we get a palindrome (57197279175).

The spelling of 55172152020 in words is "fifty-five billion, one hundred seventy-two million, one hundred fifty-two thousand, twenty".