19640711994 has 16 divisors (see below), whose sum is σ = 39405343968. Its totient is φ = 6526250672.

The previous prime is 19640711989. The next prime is 19640712031. The reversal of 19640711994 is 49911704691.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5161272 + ... + 5165075.

It is an arithmetic number, because the mean of its divisors is an integer number (2462833998).

Almost surely, 2^19640711994 is an apocalyptic number.

19640711994 is an abundant number, since it is smaller than the sum of its proper divisors (19764631974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19640711994 is a wasteful number, since it uses less digits than its factorization.

19640711994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10326669.

The product of its (nonzero) digits is 489888, while the sum is 51.

The spelling of 19640711994 in words is "nineteen billion, six hundred forty million, seven hundred eleven thousand, nine hundred ninety-four".