18957274723365 has 64 divisors (see below), whose sum is σ = 33688229743872. Its totient is φ = 9025478553600.

The previous prime is 18957274723357. The next prime is 18957274723367. The reversal of 18957274723365 is 56332747275981.

It is not a de Polignac number, because 18957274723365 - 2³ = 18957274723357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18957274723365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18957274723367) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4380447 + ... + 7556643.

It is an arithmetic number, because the mean of its divisors is an integer number (526378589748).

Almost surely, 2^{18957274723365} is an apocalyptic number.

18957274723365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18957274723365 is a deficient number, since it is larger than the sum of its proper divisors (14730955020507).

18957274723365 is a wasteful number, since it uses less digits than its factorization.

18957274723365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176870.

The product of its digits is 533433600, while the sum is 69.

The spelling of 18957274723365 in words is "eighteen trillion, nine hundred fifty-seven billion, two hundred seventy-four million, seven hundred twenty-three thousand, three hundred sixty-five".