18297644393 has 16 divisors (see below), whose sum is σ = 21027654144. Its totient is φ = 15596867520.

The previous prime is 18297644341. The next prime is 18297644419. The reversal of 18297644393 is 39344679281.

It is a cyclic number.

It is not a de Polignac number, because 18297644393 - 2⁸ = 18297644137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18297644293) 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, 1047971 + ... + 1065287.

It is an arithmetic number, because the mean of its divisors is an integer number (1314228384).

Almost surely, 2^18297644393 is an apocalyptic number.

It is an amenable number.

18297644393 is a deficient number, since it is larger than the sum of its proper divisors (2730009751).

18297644393 is a wasteful number, since it uses less digits than its factorization.

18297644393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18152.

The product of its digits is 7838208, while the sum is 56.

The spelling of 18297644393 in words is "eighteen billion, two hundred ninety-seven million, six hundred forty-four thousand, three hundred ninety-three".