55642551720 has 384 divisors, whose sum is σ = 202300934400. Its totient is φ = 12192768000.

The previous prime is 55642551703. The next prime is 55642551721. The reversal of 55642551720 is 2715524655.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (55642551721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25747440 + ... + 25749600.

It is an arithmetic number, because the mean of its divisors is an integer number (526825350).

Almost surely, 2^55642551720 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 55642551720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101150467200).

55642551720 is an abundant number, since it is smaller than the sum of its proper divisors (146658382680).

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

55642551720 is a wasteful number, since it uses less digits than its factorization.

55642551720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369 (or 2358 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 42.

The spelling of 55642551720 in words is "fifty-five billion, six hundred forty-two million, five hundred fifty-one thousand, seven hundred twenty".