19947596659 has 4 divisors (see below), whose sum is σ = 20134022904. Its totient is φ = 19761170416.

The previous prime is 19947596651. The next prime is 19947596701. The reversal of 19947596659 is 95669574991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19947596659 - 2³ = 19947596651 is a prime.

It is a super-2 number, since 2×19947596659² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19947596651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93212962 + ... + 93213175.

It is an arithmetic number, because the mean of its divisors is an integer number (5033505726).

Almost surely, 2^19947596659 is an apocalyptic number.

19947596659 is a deficient number, since it is larger than the sum of its proper divisors (186426245).

19947596659 is a wasteful number, since it uses less digits than its factorization.

19947596659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186426244.

The product of its digits is 165337200, while the sum is 70.

The spelling of 19947596659 in words is "nineteen billion, nine hundred forty-seven million, five hundred ninety-six thousand, six hundred fifty-nine".