61307775820 has 24 divisors (see below), whose sum is σ = 128816720928. Its totient is φ = 24509702400.

The previous prime is 61307775799. The next prime is 61307775827. The reversal of 61307775820 is 2857770316.

61307775820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (61307775827) 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, 800461 + ... + 873700.

It is an arithmetic number, because the mean of its divisors is an integer number (5367363372).

Almost surely, 2^61307775820 is an apocalyptic number.

It is an amenable number.

61307775820 is an abundant number, since it is smaller than the sum of its proper divisors (67508945108).

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

61307775820 is a wasteful number, since it uses less digits than its factorization.

61307775820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676001 (or 1675999 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 61307775820 in words is "sixty-one billion, three hundred seven million, seven hundred seventy-five thousand, eight hundred twenty".