19757974612 has 6 divisors (see below), whose sum is σ = 34576455578. Its totient is φ = 9878987304.

The previous prime is 19757974591. The next prime is 19757974631. The reversal of 19757974612 is 21647975791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15221143876 + 4536830736 = 123374^2 + 67356^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2469746823 + ... + 2469746830.

Almost surely, 2^19757974612 is an apocalyptic number.

It is an amenable number.

19757974612 is a deficient number, since it is larger than the sum of its proper divisors (14818480966).

19757974612 is a wasteful number, since it uses less digits than its factorization.

19757974612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4939493657 (or 4939493655 counting only the distinct ones).

The product of its digits is 6667920, while the sum is 58.

The spelling of 19757974612 in words is "nineteen billion, seven hundred fifty-seven million, nine hundred seventy-four thousand, six hundred twelve".