55878977172 has 48 divisors (see below), whose sum is σ = 135096050880. Its totient is φ = 17965129728.

The previous prime is 55878977053. The next prime is 55878977177. The reversal of 55878977172 is 27177987855.

It is a super-3 number, since 3×55878977172³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55878977177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707053 + ... + 782100.

It is an arithmetic number, because the mean of its divisors is an integer number (2814501060).

Almost surely, 2^55878977172 is an apocalyptic number.

It is an amenable number.

55878977172 is an abundant number, since it is smaller than the sum of its proper divisors (79217073708).

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

55878977172 is a wasteful number, since it uses less digits than its factorization.

55878977172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489272 (or 1489270 counting only the distinct ones).

The product of its digits is 69148800, while the sum is 66.

The spelling of 55878977172 in words is "fifty-five billion, eight hundred seventy-eight million, nine hundred seventy-seven thousand, one hundred seventy-two".