55398697920 has 336 divisors, whose sum is σ = 201088630080. Its totient is φ = 13970423808.

The previous prime is 55398697877. The next prime is 55398697933. The reversal of 55398697920 is 2979689355.

55398697920 is a `hidden beast` number, since 5 + 539 + 8 + 6 + 9 + 7 + 92 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5890662 + ... + 5900058.

Almost surely, 2^55398697920 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 55398697920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100544315040).

55398697920 is an abundant number, since it is smaller than the sum of its proper divisors (145689932160).

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

55398697920 is a wasteful number, since it uses less digits than its factorization.

55398697920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9532 (or 9519 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 63.

The spelling of 55398697920 in words is "fifty-five billion, three hundred ninety-eight million, six hundred ninety-seven thousand, nine hundred twenty".