19653440974 has 4 divisors (see below), whose sum is σ = 29480161464. Its totient is φ = 9826720486.

The previous prime is 19653440957. The next prime is 19653441001. The reversal of 19653440974 is 47904435691.

It is a semiprime because it is the product of two primes.

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, 4913360242 + ... + 4913360245.

It is an arithmetic number, because the mean of its divisors is an integer number (7370040366).

Almost surely, 2^19653440974 is an apocalyptic number.

19653440974 is a deficient number, since it is larger than the sum of its proper divisors (9826720490).

19653440974 is an equidigital number, since it uses as much as digits as its factorization.

19653440974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9826720489.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 19653440974 in words is "nineteen billion, six hundred fifty-three million, four hundred forty thousand, nine hundred seventy-four".