19652659997 has 4 divisors (see below), whose sum is σ = 19832959740. Its totient is φ = 19472360256.

The previous prime is 19652659979. The next prime is 19652660077. The reversal of 19652659997 is 79995625691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16222097956 + 3430562041 = 127366^2 + 58571^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19652659997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19652659967) 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, 90149708 + ... + 90149925.

It is an arithmetic number, because the mean of its divisors is an integer number (4958239935).

Almost surely, 2^19652659997 is an apocalyptic number.

It is an amenable number.

19652659997 is a deficient number, since it is larger than the sum of its proper divisors (180299743).

19652659997 is a wasteful number, since it uses less digits than its factorization.

19652659997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180299742.

The product of its digits is 82668600, while the sum is 68.

The spelling of 19652659997 in words is "nineteen billion, six hundred fifty-two million, six hundred fifty-nine thousand, nine hundred ninety-seven".