55720121610 has 64 divisors (see below), whose sum is σ = 134377833600. Its totient is φ = 14786703360.

The previous prime is 55720121603. The next prime is 55720121623. The reversal of 55720121610 is 1612102755.

55720121610 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5512341 + ... + 5522439.

It is an arithmetic number, because the mean of its divisors is an integer number (2099653650).

Almost surely, 2^55720121610 is an apocalyptic number.

55720121610 is an abundant number, since it is smaller than the sum of its proper divisors (78657711990).

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

55720121610 is a wasteful number, since it uses less digits than its factorization.

55720121610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10983.

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 55720121610 in words is "fifty-five billion, seven hundred twenty million, one hundred twenty-one thousand, six hundred ten".