19698904556 has 6 divisors (see below), whose sum is σ = 34473082980. Its totient is φ = 9849452276.

The previous prime is 19698904549. The next prime is 19698904573. The reversal of 19698904556 is 65540989691.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2462363066 + ... + 2462363073.

It is an arithmetic number, because the mean of its divisors is an integer number (5745513830).

Almost surely, 2^19698904556 is an apocalyptic number.

It is an amenable number.

19698904556 is a deficient number, since it is larger than the sum of its proper divisors (14774178424).

19698904556 is a wasteful number, since it uses less digits than its factorization.

19698904556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924726143 (or 4924726141 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 62.

The spelling of 19698904556 in words is "nineteen billion, six hundred ninety-eight million, nine hundred four thousand, five hundred fifty-six".