18761957139 has 4 divisors (see below), whose sum is σ = 25015942856. Its totient is φ = 12507971424.

The previous prime is 18761957063. The next prime is 18761957143. The reversal of 18761957139 is 93175916781.

It is a happy number.

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

It is not a de Polignac number, because 18761957139 - 2²⁰ = 18760908563 is a prime.

It is a super-2 number, since 2×18761957139² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18761957339) 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 3 ways as a sum of consecutive naturals, for example, 3126992854 + ... + 3126992859.

It is an arithmetic number, because the mean of its divisors is an integer number (6253985714).

Almost surely, 2^18761957139 is an apocalyptic number.

18761957139 is a deficient number, since it is larger than the sum of its proper divisors (6253985717).

18761957139 is an equidigital number, since it uses as much as digits as its factorization.

18761957139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6253985716.

The product of its digits is 2857680, while the sum is 57.

The spelling of 18761957139 in words is "eighteen billion, seven hundred sixty-one million, nine hundred fifty-seven thousand, one hundred thirty-nine".