61371747656 has 16 divisors (see below), whose sum is σ = 116648357100. Its totient is φ = 30265519104.

The previous prime is 61371747637. The next prime is 61371747761. The reversal of 61371747656 is 65674717316.

It can be written as a sum of positive squares in 2 ways, for example, as 56961459556 + 4410288100 = 238666^2 + 66410^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61371747598 and 61371747607.

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, 52543721 + ... + 52544888.

Almost surely, 2^61371747656 is an apocalyptic number.

It is an amenable number.

61371747656 is a deficient number, since it is larger than the sum of its proper divisors (55276609444).

61371747656 is a wasteful number, since it uses less digits than its factorization.

61371747656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105088688 (or 105088684 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 53.

The spelling of 61371747656 in words is "sixty-one billion, three hundred seventy-one million, seven hundred forty-seven thousand, six hundred fifty-six".