61810535664 has 60 divisors (see below), whose sum is σ = 174663146736. Its totient is φ = 20403472896.

The previous prime is 61810535663. The next prime is 61810535701. The reversal of 61810535664 is 46653501816.

61810535664 is a `hidden beast` number, since 6 + 1 + 81 + 0 + 5 + 3 + 566 + 4 = 666.

61810535664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61810535663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2068857 + ... + 2098520.

Almost surely, 2^61810535664 is an apocalyptic number.

It is an amenable number.

61810535664 is an abundant number, since it is smaller than the sum of its proper divisors (112852611072).

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

61810535664 is a wasteful number, since it uses less digits than its factorization.

61810535664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4167494 (or 4167485 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 61810535664 in words is "sixty-one billion, eight hundred ten million, five hundred thirty-five thousand, six hundred sixty-four".