18706907368537 has 4 divisors (see below), whose sum is σ = 18917097339060. Its totient is φ = 18496717398016.

The previous prime is 18706907368469. The next prime is 18706907368543. The reversal of 18706907368537 is 73586370960781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1911303485001 + 16795603883536 = 1382499^2 + 4098244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18706907368537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18706907368637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105094985128 + ... + 105094985305.

It is an arithmetic number, because the mean of its divisors is an integer number (4729274334765).

Almost surely, 2^{18706907368537} is an apocalyptic number.

It is an amenable number.

18706907368537 is a deficient number, since it is larger than the sum of its proper divisors (210189970523).

18706907368537 is an equidigital number, since it uses as much as digits as its factorization.

18706907368537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210189970522.

The product of its (nonzero) digits is 320060160, while the sum is 70.

The spelling of 18706907368537 in words is "eighteen trillion, seven hundred six billion, nine hundred seven million, three hundred sixty-eight thousand, five hundred thirty-seven".