1639916694 has 24 divisors (see below), whose sum is σ = 3826472832. Its totient is φ = 504589680.

The previous prime is 1639916689. The next prime is 1639916791. The reversal of 1639916694 is 4966199361.

1639916694 is a `hidden beast` number, since 1 + 6 + 399 + 166 + 94 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1639916694.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3503862 + ... + 3504329.

It is an arithmetic number, because the mean of its divisors is an integer number (159436368).

Almost surely, 2^1639916694 is an apocalyptic number.

1639916694 is an abundant number, since it is smaller than the sum of its proper divisors (2186556138).

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

1639916694 is a wasteful number, since it uses less digits than its factorization.

1639916694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7008212 (or 7008209 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 1639916694 is about 40495.8849020490. The cubic root of 1639916694 is about 1179.2537400593.

The spelling of 1639916694 in words is "one billion, six hundred thirty-nine million, nine hundred sixteen thousand, six hundred ninety-four".