18750581137 has 4 divisors (see below), whose sum is σ = 19853556516. Its totient is φ = 17647605760.

The previous prime is 18750581123. The next prime is 18750581141. The reversal of 18750581137 is 73118505781.

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 5529260881 + 13221320256 = 74359^2 + 114984^2 .

It is a cyclic number.

It is not a de Polignac number, because 18750581137 - 2⁷ = 18750581009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18750581147) 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, 551487664 + ... + 551487697.

It is an arithmetic number, because the mean of its divisors is an integer number (4963389129).

Almost surely, 2^18750581137 is an apocalyptic number.

18750581137 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18750581137 is a deficient number, since it is larger than the sum of its proper divisors (1102975379).

18750581137 is a wasteful number, since it uses less digits than its factorization.

18750581137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102975378.

The product of its (nonzero) digits is 235200, while the sum is 46.

The spelling of 18750581137 in words is "eighteen billion, seven hundred fifty million, five hundred eighty-one thousand, one hundred thirty-seven".