61630571916 has 18 divisors (see below), whose sum is σ = 155788390212. Its totient is φ = 20543523960.

The previous prime is 61630571867. The next prime is 61630571923. The reversal of 61630571916 is 61917503616.

61630571916 is a `hidden beast` number, since 6 + 1 + 63 + 0 + 571 + 9 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×61630571916² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 855980130 + ... + 855980201.

Almost surely, 2^61630571916 is an apocalyptic number.

It is an amenable number.

61630571916 is an abundant number, since it is smaller than the sum of its proper divisors (94157818296).

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

61630571916 is a wasteful number, since it uses less digits than its factorization.

61630571916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711960341 (or 1711960336 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 61630571916 in words is "sixty-one billion, six hundred thirty million, five hundred seventy-one thousand, nine hundred sixteen".