61275577720 has 64 divisors (see below), whose sum is σ = 158382313920. Its totient is φ = 20899897344.

The previous prime is 61275577681. The next prime is 61275577723. The reversal of 61275577720 is 2777557216.

It is a happy number.

61275577720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61275577723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512907 + ... + 620986.

It is an arithmetic number, because the mean of its divisors is an integer number (2474723655).

Almost surely, 2^61275577720 is an apocalyptic number.

It is an amenable number.

61275577720 is an abundant number, since it is smaller than the sum of its proper divisors (97106736200).

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

61275577720 is a wasteful number, since it uses less digits than its factorization.

61275577720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134104 (or 1134100 counting only the distinct ones).

The product of its (nonzero) digits is 1440600, while the sum is 49.

The spelling of 61275577720 in words is "sixty-one billion, two hundred seventy-five million, five hundred seventy-seven thousand, seven hundred twenty".