55172343657 has 4 divisors (see below), whose sum is σ = 73563124880. Its totient is φ = 36781562436.

The previous prime is 55172343649. The next prime is 55172343689. The reversal of 55172343657 is 75634327155.

55172343657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55172343657 - 2³ = 55172343649 is a prime.

It is a super-2 number, since 2×55172343657² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55172343647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9195390607 + ... + 9195390612.

It is an arithmetic number, because the mean of its divisors is an integer number (18390781220).

Almost surely, 2^55172343657 is an apocalyptic number.

It is an amenable number.

55172343657 is a deficient number, since it is larger than the sum of its proper divisors (18390781223).

55172343657 is a wasteful number, since it uses less digits than its factorization.

55172343657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18390781222.

The product of its digits is 2646000, while the sum is 48.

The spelling of 55172343657 in words is "fifty-five billion, one hundred seventy-two million, three hundred forty-three thousand, six hundred fifty-seven".