61660390402 has 16 divisors (see below), whose sum is σ = 99724000320. Its totient is φ = 28424711952.

The previous prime is 61660390399. The next prime is 61660390403. The reversal of 61660390402 is 20409306616.

It is a happy number.

61660390402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61660390403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1391508 + ... + 1435135.

It is an arithmetic number, because the mean of its divisors is an integer number (6232750020).

Almost surely, 2^61660390402 is an apocalyptic number.

61660390402 is a deficient number, since it is larger than the sum of its proper divisors (38063609918).

61660390402 is a wasteful number, since it uses less digits than its factorization.

61660390402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827497.

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 61660390402 in words is "sixty-one billion, six hundred sixty million, three hundred ninety thousand, four hundred two".