61666121164 has 12 divisors (see below), whose sum is σ = 114263695224. Its totient is φ = 29019351104.

The previous prime is 61666121149. The next prime is 61666121183. The reversal of 61666121164 is 46112166616.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453427294 + ... + 453427429.

It is an arithmetic number, because the mean of its divisors is an integer number (9521974602).

Almost surely, 2^61666121164 is an apocalyptic number.

It is an amenable number.

61666121164 is a deficient number, since it is larger than the sum of its proper divisors (52597574060).

61666121164 is a wasteful number, since it uses less digits than its factorization.

61666121164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906854744 (or 906854742 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The spelling of 61666121164 in words is "sixty-one billion, six hundred sixty-six million, one hundred twenty-one thousand, one hundred sixty-four".