19668643970 has 32 divisors (see below), whose sum is σ = 36109644480. Its totient is φ = 7710863680.

The previous prime is 19668643963. The next prime is 19668644011. The reversal of 19668643970 is 7934686691.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495521 + ... + 533739.

It is an arithmetic number, because the mean of its divisors is an integer number (1128426390).

Almost surely, 2^19668643970 is an apocalyptic number.

19668643970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19668643970 is a deficient number, since it is larger than the sum of its proper divisors (16441000510).

19668643970 is a wasteful number, since it uses less digits than its factorization.

19668643970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39250.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 19668643970 in words is "nineteen billion, six hundred sixty-eight million, six hundred forty-three thousand, nine hundred seventy".