18199969656 has 32 divisors (see below), whose sum is σ = 49636281600. Its totient is φ = 5515142240.

The previous prime is 18199969643. The next prime is 18199969657. The reversal of 18199969656 is 65696999181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18199969657) 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, 34469376 + ... + 34469903.

It is an arithmetic number, because the mean of its divisors is an integer number (1551133800).

Almost surely, 2^18199969656 is an apocalyptic number.

It is an amenable number.

18199969656 is an abundant number, since it is smaller than the sum of its proper divisors (31436311944).

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

18199969656 is a wasteful number, since it uses less digits than its factorization.

18199969656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68939299 (or 68939295 counting only the distinct ones).

The product of its digits is 56687040, while the sum is 69.

The spelling of 18199969656 in words is "eighteen billion, one hundred ninety-nine million, nine hundred sixty-nine thousand, six hundred fifty-six".