18554634157 has 2 divisors, whose sum is σ = 18554634158. Its totient is φ = 18554634156.

The previous prime is 18554634047. The next prime is 18554634251. The reversal of 18554634157 is 75143645581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17791824996 + 762809161 = 133386^2 + 27619^2 .

It is a cyclic number.

It is not a de Polignac number, because 18554634157 - 2⁷ = 18554634029 is a prime.

It is a super-3 number, since 3×18554634157³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 18554634157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18554734157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9277317078 + 9277317079.

It is an arithmetic number, because the mean of its divisors is an integer number (9277317079).

Almost surely, 2^18554634157 is an apocalyptic number.

It is an amenable number.

18554634157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18554634157 is an equidigital number, since it uses as much as digits as its factorization.

18554634157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016000, while the sum is 49.

The spelling of 18554634157 in words is "eighteen billion, five hundred fifty-four million, six hundred thirty-four thousand, one hundred fifty-seven".