18737233454561 has 16 divisors (see below), whose sum is σ = 20359914086400. Its totient is φ = 17178219147600.

The previous prime is 18737233454549. The next prime is 18737233454573. The reversal of 18737233454561 is 16545433273781.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18737233454549) and next prime (18737233454573).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18737233454561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18737233454561.

It is not an unprimeable number, because it can be changed into a prime (18737233454581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57105470 + ... + 57432648.

It is an arithmetic number, because the mean of its divisors is an integer number (1272494630400).

Almost surely, 2^{18737233454561} is an apocalyptic number.

It is an amenable number.

18737233454561 is a deficient number, since it is larger than the sum of its proper divisors (1622680631839).

18737233454561 is a wasteful number, since it uses less digits than its factorization.

18737233454561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424460.

The product of its digits is 50803200, while the sum is 59.

The spelling of 18737233454561 in words is "eighteen trillion, seven hundred thirty-seven billion, two hundred thirty-three million, four hundred fifty-four thousand, five hundred sixty-one".