19621170745 has 16 divisors (see below), whose sum is σ = 25788248640. Its totient is φ = 14213080000.

The previous prime is 19621170739. The next prime is 19621170851. The reversal of 19621170745 is 54707112691.

It is a happy number.

It is not a de Polignac number, because 19621170745 - 2⁵ = 19621170713 is a prime.

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, 696850 + ... + 724459.

It is an arithmetic number, because the mean of its divisors is an integer number (1611765540).

Almost surely, 2^19621170745 is an apocalyptic number.

It is an amenable number.

19621170745 is a deficient number, since it is larger than the sum of its proper divisors (6167077895).

19621170745 is a wasteful number, since it uses less digits than its factorization.

19621170745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421576.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 19621170745 in words is "nineteen billion, six hundred twenty-one million, one hundred seventy thousand, seven hundred forty-five".