61516661000 has 64 divisors (see below), whose sum is σ = 151525296000. Its totient is φ = 23311569600.

The previous prime is 61516660999. The next prime is 61516661027. The reversal of 61516661000 is 16661516.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1599860 + ... + 1637859.

It is an arithmetic number, because the mean of its divisors is an integer number (2367582750).

Almost surely, 2^61516661000 is an apocalyptic number.

It is an amenable number.

61516661000 is an abundant number, since it is smaller than the sum of its proper divisors (90008635000).

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

61516661000 is a wasteful number, since it uses less digits than its factorization.

61516661000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3237759 (or 3237745 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 61516661000 in words is "sixty-one billion, five hundred sixteen million, six hundred sixty-one thousand".