19718856652 has 24 divisors (see below), whose sum is σ = 38160782352. Its totient is φ = 8840332800.

The previous prime is 19718856611. The next prime is 19718856671. The reversal of 19718856652 is 25665881791.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3066349 + ... + 3072772.

It is an arithmetic number, because the mean of its divisors is an integer number (1590032598).

Almost surely, 2^19718856652 is an apocalyptic number.

It is an amenable number.

19718856652 is a deficient number, since it is larger than the sum of its proper divisors (18441925700).

19718856652 is a wasteful number, since it uses less digits than its factorization.

19718856652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6139209 (or 6139207 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 58.

The spelling of 19718856652 in words is "nineteen billion, seven hundred eighteen million, eight hundred fifty-six thousand, six hundred fifty-two".