61276780660 has 24 divisors (see below), whose sum is σ = 128826351360. Its totient is φ = 24483071904.

The previous prime is 61276780657. The next prime is 61276780681. The reversal of 61276780660 is 6608767216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1709340 + ... + 1744819.

It is an arithmetic number, because the mean of its divisors is an integer number (5367764640).

Almost surely, 2^61276780660 is an apocalyptic number.

It is an amenable number.

61276780660 is an abundant number, since it is smaller than the sum of its proper divisors (67549570700).

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

61276780660 is a wasteful number, since it uses less digits than its factorization.

61276780660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455055 (or 3455053 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 61276780660 in words is "sixty-one billion, two hundred seventy-six million, seven hundred eighty thousand, six hundred sixty".