55078278864 has 40 divisors (see below), whose sum is σ = 162612062400. Its totient is φ = 15736651008.

The previous prime is 55078278859. The next prime is 55078278889. The reversal of 55078278864 is 46887287055.

It is a junction number, because it is equal to n+sod(n) for n = 55078278798 and 55078278807.

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, 81961389 + ... + 81962060.

It is an arithmetic number, because the mean of its divisors is an integer number (4065301560).

Almost surely, 2^55078278864 is an apocalyptic number.

It is an amenable number.

55078278864 is an abundant number, since it is smaller than the sum of its proper divisors (107533783536).

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

55078278864 is a wasteful number, since it uses less digits than its factorization.

55078278864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163923467 (or 163923461 counting only the distinct ones).

The product of its (nonzero) digits is 30105600, while the sum is 60.

The spelling of 55078278864 in words is "fifty-five billion, seventy-eight million, two hundred seventy-eight thousand, eight hundred sixty-four".