61660165564 has 6 divisors (see below), whose sum is σ = 107905289744. Its totient is φ = 30830082780.

The previous prime is 61660165531. The next prime is 61660165579. The reversal of 61660165564 is 46556106616.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7707520692 + ... + 7707520699.

Almost surely, 2^61660165564 is an apocalyptic number.

It is an amenable number.

61660165564 is a deficient number, since it is larger than the sum of its proper divisors (46245124180).

61660165564 is a wasteful number, since it uses less digits than its factorization.

61660165564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15415041395 (or 15415041393 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 61660165564 in words is "sixty-one billion, six hundred sixty million, one hundred sixty-five thousand, five hundred sixty-four".