18916897659 has 16 divisors (see below), whose sum is σ = 27659556864. Its totient is φ = 11404757600.

The previous prime is 18916897651. The next prime is 18916897661. The reversal of 18916897659 is 95679861981.

It is a cyclic number.

It is not a de Polignac number, because 18916897659 - 2³ = 18916897651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18916897593 and 18916897602.

It is not an unprimeable number, because it can be changed into a prime (18916897651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1494324 + ... + 1506929.

It is an arithmetic number, because the mean of its divisors is an integer number (1728722304).

Almost surely, 2^18916897659 is an apocalyptic number.

18916897659 is a deficient number, since it is larger than the sum of its proper divisors (8742659205).

18916897659 is a wasteful number, since it uses less digits than its factorization.

18916897659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001458.

The product of its digits is 58786560, while the sum is 69.

The spelling of 18916897659 in words is "eighteen billion, nine hundred sixteen million, eight hundred ninety-seven thousand, six hundred fifty-nine".