55178864640 has 144 divisors (see below), whose sum is σ = 191240349300. Its totient is φ = 14714339328.

The previous prime is 55178864591. The next prime is 55178864641. The reversal of 55178864640 is 4646887155.

55178864640 is a `hidden beast` number, since 5 + 5 + 178 + 8 + 6 + 464 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46200923136 + 8977941504 = 214944^2 + 94752^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (55178864641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207205 + ... + 391524.

Almost surely, 2^55178864640 is an apocalyptic number.

It is an amenable number.

55178864640 is an abundant number, since it is smaller than the sum of its proper divisors (136061484660).

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

55178864640 is a wasteful number, since it uses less digits than its factorization.

55178864640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598762 (or 598739 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 55178864640 in words is "fifty-five billion, one hundred seventy-eight million, eight hundred sixty-four thousand, six hundred forty".