18951956648 has 16 divisors (see below), whose sum is σ = 35536380000. Its totient is φ = 9475588656.

The previous prime is 18951956633. The next prime is 18951956651. The reversal of 18951956648 is 84665915981.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349253 + ... + 399851.

It is an arithmetic number, because the mean of its divisors is an integer number (2221023750).

Almost surely, 2^18951956648 is an apocalyptic number.

It is an amenable number.

18951956648 is a deficient number, since it is larger than the sum of its proper divisors (16584423352).

18951956648 is a wasteful number, since it uses less digits than its factorization.

18951956648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97424 (or 97420 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 62.

The spelling of 18951956648 in words is "eighteen billion, nine hundred fifty-one million, nine hundred fifty-six thousand, six hundred forty-eight".