19619813906 has 32 divisors (see below), whose sum is σ = 37544905728. Its totient is φ = 7466311440.

The previous prime is 19619813891. The next prime is 19619813923. The reversal of 19619813906 is 60931891691.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1474790 + ... + 1488033.

It is an arithmetic number, because the mean of its divisors is an integer number (1173278304).

Almost surely, 2^19619813906 is an apocalyptic number.

19619813906 is a deficient number, since it is larger than the sum of its proper divisors (17925091822).

19619813906 is a wasteful number, since it uses less digits than its factorization.

19619813906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2962886.

The product of its (nonzero) digits is 629856, while the sum is 53.

The spelling of 19619813906 in words is "nineteen billion, six hundred nineteen million, eight hundred thirteen thousand, nine hundred six".