61731461660 has 24 divisors (see below), whose sum is σ = 141421167216. Its totient is φ = 22447804160.

The previous prime is 61731461647. The next prime is 61731461683. The reversal of 61731461660 is 6616413716.

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, 140298557 + ... + 140298996.

It is an arithmetic number, because the mean of its divisors is an integer number (5892548634).

Almost surely, 2^61731461660 is an apocalyptic number.

It is an amenable number.

61731461660 is an abundant number, since it is smaller than the sum of its proper divisors (79689705556).

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

61731461660 is a wasteful number, since it uses less digits than its factorization.

61731461660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280597573 (or 280597571 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 61731461660 in words is "sixty-one billion, seven hundred thirty-one million, four hundred sixty-one thousand, six hundred sixty".