18951012616 has 32 divisors (see below), whose sum is σ = 37759233240. Its totient is φ = 8885910528.

The previous prime is 18951012611. The next prime is 18951012617. The reversal of 18951012616 is 61621015981.

It can be written as a sum of positive squares in 4 ways, for example, as 11805691716 + 7145320900 = 108654^2 + 84530^2 .

It is not an unprimeable number, because it can be changed into a prime (18951012611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213855 + ... + 289198.

Almost surely, 2^18951012616 is an apocalyptic number.

It is an amenable number.

18951012616 is a deficient number, since it is larger than the sum of its proper divisors (18808220624).

18951012616 is a wasteful number, since it uses less digits than its factorization.

18951012616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503353 (or 503349 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 18951012616 in words is "eighteen billion, nine hundred fifty-one million, twelve thousand, six hundred sixteen".