16591961956 has 24 divisors (see below), whose sum is σ = 29151017280. Its totient is φ = 8263164000.

The previous prime is 16591961933. The next prime is 16591962007. The reversal of 16591961956 is 65916919561.

It is a happy number.

It is a super-3 number, since 3×16591961956³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16591961956.

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, 1102281 + ... + 1117231.

It is an arithmetic number, because the mean of its divisors is an integer number (1214625720).

Almost surely, 2^16591961956 is an apocalyptic number.

It is an amenable number.

16591961956 is a deficient number, since it is larger than the sum of its proper divisors (12559055324).

16591961956 is a wasteful number, since it uses less digits than its factorization.

16591961956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16035 (or 16033 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 58.

The spelling of 16591961956 in words is "sixteen billion, five hundred ninety-one million, nine hundred sixty-one thousand, nine hundred fifty-six".