61640026344 has 48 divisors (see below), whose sum is σ = 179783412900. Its totient is φ = 18966161664.

The previous prime is 61640026339. The next prime is 61640026387. The reversal of 61640026344 is 44362004616.

61640026344 is a `hidden beast` number, since 6 + 1 + 640 + 0 + 2 + 6 + 3 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 58836323844 + 2803702500 = 242562^2 + 52950^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 61640026299 and 61640026308.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32926429 + ... + 32928300.

Almost surely, 2^61640026344 is an apocalyptic number.

It is an amenable number.

61640026344 is an abundant number, since it is smaller than the sum of its proper divisors (118143386556).

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

61640026344 is a wasteful number, since it uses less digits than its factorization.

61640026344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65854754 (or 65854747 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 61640026344 in words is "sixty-one billion, six hundred forty million, twenty-six thousand, three hundred forty-four".