634156551616 has 56 divisors (see below), whose sum is σ = 1438253212896. Its totient is φ = 271766876160.

The previous prime is 634156551599. The next prime is 634156551619. The reversal of 634156551616 is 616155651436.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×634156551616² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 634156551616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634156551619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15416196 + ... + 15457276.

Almost surely, 2^634156551616 is an apocalyptic number.

It is an amenable number.

634156551616 is an abundant number, since it is smaller than the sum of its proper divisors (804096661280).

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

634156551616 is a wasteful number, since it uses less digits than its factorization.

634156551616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75557 (or 75547 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 49.

The spelling of 634156551616 in words is "six hundred thirty-four billion, one hundred fifty-six million, five hundred fifty-one thousand, six hundred sixteen".