61077381220 has 12 divisors (see below), whose sum is σ = 128262500604. Its totient is φ = 24430952480.

The previous prime is 61077381191. The next prime is 61077381251. The reversal of 61077381220 is 2218377016.

61077381220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7757029476 + 53320351744 = 88074^2 + 230912^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61077381220.

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, 1526934511 + ... + 1526934550.

It is an arithmetic number, because the mean of its divisors is an integer number (10688541717).

Almost surely, 2^61077381220 is an apocalyptic number.

It is an amenable number.

61077381220 is an abundant number, since it is smaller than the sum of its proper divisors (67185119384).

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

61077381220 is a wasteful number, since it uses less digits than its factorization.

61077381220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053869070 (or 3053869068 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 61077381220 in words is "sixty-one billion, seventy-seven million, three hundred eighty-one thousand, two hundred twenty".