61639265166 has 16 divisors (see below), whose sum is σ = 123332461824. Its totient is φ = 20537433144.

The previous prime is 61639265147. The next prime is 61639265201. The reversal of 61639265166 is 66156293616.

It is a happy number.

It is a super-2 number, since 2×61639265166² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2232280 + ... + 2259723.

It is an arithmetic number, because the mean of its divisors is an integer number (7708278864).

Almost surely, 2^61639265166 is an apocalyptic number.

61639265166 is an abundant number, since it is smaller than the sum of its proper divisors (61693196658).

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

61639265166 is a wasteful number, since it uses less digits than its factorization.

61639265166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4494295.

The product of its digits is 2099520, while the sum is 51.

The spelling of 61639265166 in words is "sixty-one billion, six hundred thirty-nine million, two hundred sixty-five thousand, one hundred sixty-six".