18150916957 has 4 divisors (see below), whose sum is σ = 18194031196. Its totient is φ = 18107802720.

The previous prime is 18150916913. The next prime is 18150916967. The reversal of 18150916957 is 75961905181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75961905181 = 20233 ⋅3754357.

It can be written as a sum of positive squares in 2 ways, for example, as 7215822916 + 10935094041 = 84946^2 + 104571^2 .

It is a cyclic number.

It is not a de Polignac number, because 18150916957 - 2⁷ = 18150916829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18150916967) 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, 21556488 + ... + 21557329.

It is an arithmetic number, because the mean of its divisors is an integer number (4548507799).

Almost surely, 2^18150916957 is an apocalyptic number.

It is an amenable number.

18150916957 is a deficient number, since it is larger than the sum of its proper divisors (43114239).

18150916957 is an equidigital number, since it uses as much as digits as its factorization.

18150916957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43114238.

The product of its (nonzero) digits is 680400, while the sum is 52.

The spelling of 18150916957 in words is "eighteen billion, one hundred fifty million, nine hundred sixteen thousand, nine hundred fifty-seven".