61120515220 has 12 divisors (see below), whose sum is σ = 128353082004. Its totient is φ = 24448206080.

The previous prime is 61120515149. The next prime is 61120515263. The reversal of 61120515220 is 2251502116.

It can be written as a sum of positive squares in 2 ways, for example, as 6257759236 + 54862755984 = 79106^2 + 234228^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528012861 + ... + 1528012900.

It is an arithmetic number, because the mean of its divisors is an integer number (10696090167).

Almost surely, 2^61120515220 is an apocalyptic number.

It is an amenable number.

61120515220 is an abundant number, since it is smaller than the sum of its proper divisors (67232566784).

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

61120515220 is a wasteful number, since it uses less digits than its factorization.

61120515220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056025770 (or 3056025768 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 61120515220 in words is "sixty-one billion, one hundred twenty million, five hundred fifteen thousand, two hundred twenty".