19791053666 has 32 divisors (see below), whose sum is σ = 32121847296. Its totient is φ = 9125424000.

The previous prime is 19791053663. The next prime is 19791053677. The reversal of 19791053666 is 66635019791.

It is not an unprimeable number, because it can be changed into a prime (19791053663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18776 + ... + 199836.

It is an arithmetic number, because the mean of its divisors is an integer number (1003807728).

Almost surely, 2^19791053666 is an apocalyptic number.

19791053666 is a deficient number, since it is larger than the sum of its proper divisors (12330793630).

19791053666 is a wasteful number, since it uses less digits than its factorization.

19791053666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181178.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The spelling of 19791053666 in words is "nineteen billion, seven hundred ninety-one million, fifty-three thousand, six hundred sixty-six".