55990457992 has 96 divisors (see below), whose sum is σ = 126464247000. Its totient is φ = 23144432640.

The previous prime is 55990457989. The next prime is 55990457993. The reversal of 55990457992 is 29975409955.

It can be written as a sum of positive squares in 4 ways, for example, as 55972935396 + 17522596 = 236586^2 + 4186^2 .

It is not an unprimeable number, because it can be changed into a prime (55990457993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14651442 + ... + 14655262.

Almost surely, 2^55990457992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55990457992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63232123500).

55990457992 is an abundant number, since it is smaller than the sum of its proper divisors (70473789008).

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

55990457992 is a wasteful number, since it uses less digits than its factorization.

55990457992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5159 (or 5148 counting only the distinct ones).

The product of its (nonzero) digits is 45927000, while the sum is 64.

The spelling of 55990457992 in words is "fifty-five billion, nine hundred ninety million, four hundred fifty-seven thousand, nine hundred ninety-two".