19961433968 has 40 divisors (see below), whose sum is σ = 44222357088. Its totient is φ = 8550634752.

The previous prime is 19961433923. The next prime is 19961433971. The reversal of 19961433968 is 86933416991.

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, 186530 + ... + 273342.

Almost surely, 2^19961433968 is an apocalyptic number.

It is an amenable number.

19961433968 is an abundant number, since it is smaller than the sum of its proper divisors (24260923120).

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

19961433968 is a wasteful number, since it uses less digits than its factorization.

19961433968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88881 (or 88875 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 59.

The spelling of 19961433968 in words is "nineteen billion, nine hundred sixty-one million, four hundred thirty-three thousand, nine hundred sixty-eight".