18626748157 has 4 divisors (see below), whose sum is σ = 18628802140. Its totient is φ = 18624694176.

The previous prime is 18626748121. The next prime is 18626748163. The reversal of 18626748157 is 75184762681.

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 7929190116 + 10697558041 = 89046^2 + 103429^2 .

It is a cyclic number.

It is not a de Polignac number, because 18626748157 - 2²⁷ = 18492530429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18626748098 and 18626748107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18626746157) 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, 1013328 + ... + 1031545.

It is an arithmetic number, because the mean of its divisors is an integer number (4657200535).

Almost surely, 2^18626748157 is an apocalyptic number.

It is an amenable number.

18626748157 is a deficient number, since it is larger than the sum of its proper divisors (2053983).

18626748157 is an equidigital number, since it uses as much as digits as its factorization.

18626748157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053982.

The product of its digits is 4515840, while the sum is 55.

The spelling of 18626748157 in words is "eighteen billion, six hundred twenty-six million, seven hundred forty-eight thousand, one hundred fifty-seven".