55571557620 has 24 divisors (see below), whose sum is σ = 155600361504. Its totient is φ = 14819082016.

The previous prime is 55571557609. The next prime is 55571557627. The reversal of 55571557620 is 2675517555.

55571557620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 55571557620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55571557627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 463096254 + ... + 463096373.

It is an arithmetic number, because the mean of its divisors is an integer number (6483348396).

Almost surely, 2^55571557620 is an apocalyptic number.

It is an amenable number.

55571557620 is an abundant number, since it is smaller than the sum of its proper divisors (100028803884).

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

55571557620 is a wasteful number, since it uses less digits than its factorization.

55571557620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926192639 (or 926192637 counting only the distinct ones).

The product of its (nonzero) digits is 1837500, while the sum is 48.

The spelling of 55571557620 in words is "fifty-five billion, five hundred seventy-one million, five hundred fifty-seven thousand, six hundred twenty".