61810681050 has 36 divisors (see below), whose sum is σ = 166064697630. Its totient is φ = 16482848160.

The previous prime is 61810681013. The next prime is 61810681061. The reversal of 61810681050 is 5018601816.

It can be written as a sum of positive squares in 3 ways, for example, as 33937376841 + 27873304209 = 184221^2 + 166953^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61810680996 and 61810681014.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 68678085 + ... + 68678984.

Almost surely, 2^61810681050 is an apocalyptic number.

61810681050 is an abundant number, since it is smaller than the sum of its proper divisors (104254016580).

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

61810681050 is a wasteful number, since it uses less digits than its factorization.

61810681050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137357087 (or 137357079 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 61810681050 in words is "sixty-one billion, eight hundred ten million, six hundred eighty-one thousand, fifty".