19961565475 has 6 divisors (see below), whose sum is σ = 24752341220. Its totient is φ = 15969252360.

The previous prime is 19961565467. The next prime is 19961565497. The reversal of 19961565475 is 57456516991.

It is a happy number.

It is not a de Polignac number, because 19961565475 - 2³ = 19961565467 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399231285 + ... + 399231334.

Almost surely, 2^19961565475 is an apocalyptic number.

19961565475 is a deficient number, since it is larger than the sum of its proper divisors (4790775745).

19961565475 is an equidigital number, since it uses as much as digits as its factorization.

19961565475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798462629 (or 798462624 counting only the distinct ones).

The product of its digits is 10206000, while the sum is 58.

The spelling of 19961565475 in words is "nineteen billion, nine hundred sixty-one million, five hundred sixty-five thousand, four hundred seventy-five".