61810681056 has 48 divisors (see below), whose sum is σ = 162273459600. Its totient is φ = 20600967168.

The previous prime is 61810681013. The next prime is 61810681061. The reversal of 61810681056 is 65018601816.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 61810680999 and 61810681017.

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, 821130 + ... + 893238.

It is an arithmetic number, because the mean of its divisors is an integer number (3380697075).

Almost surely, 2^61810681056 is an apocalyptic number.

It is an amenable number.

61810681056 is an abundant number, since it is smaller than the sum of its proper divisors (100462778544).

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

61810681056 is a wasteful number, since it uses less digits than its factorization.

61810681056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81051 (or 81043 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The spelling of 61810681056 in words is "sixty-one billion, eight hundred ten million, six hundred eighty-one thousand, fifty-six".