55172859442 has 4 divisors (see below), whose sum is σ = 82759289166. Its totient is φ = 27586429720.

The previous prime is 55172859437. The next prime is 55172859451. The reversal of 55172859442 is 24495827155.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 46754980441 + 8417879001 = 216229^2 + 91749^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55172859442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13793214859 + ... + 13793214862.

Almost surely, 2^55172859442 is an apocalyptic number.

55172859442 is a deficient number, since it is larger than the sum of its proper divisors (27586429724).

55172859442 is a wasteful number, since it uses less digits than its factorization.

55172859442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27586429723.

The product of its digits is 4032000, while the sum is 52.

The spelling of 55172859442 in words is "fifty-five billion, one hundred seventy-two million, eight hundred fifty-nine thousand, four hundred forty-two".