18497660357 has 4 divisors (see below), whose sum is σ = 20179265856. Its totient is φ = 16816054860.

The previous prime is 18497660347. The next prime is 18497660359. The reversal of 18497660357 is 75306679481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75306679481 = 11 ⋅6846061771.

It is not a de Polignac number, because 18497660357 - 2¹⁰ = 18497659333 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 (18497660359) 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, 840802733 + ... + 840802754.

It is an arithmetic number, because the mean of its divisors is an integer number (5044816464).

Almost surely, 2^18497660357 is an apocalyptic number.

It is an amenable number.

18497660357 is a deficient number, since it is larger than the sum of its proper divisors (1681605499).

18497660357 is a wasteful number, since it uses less digits than its factorization.

18497660357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681605498.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 18497660357 in words is "eighteen billion, four hundred ninety-seven million, six hundred sixty thousand, three hundred fifty-seven".