18108059257 has 4 divisors (see below), whose sum is σ = 18108333940. Its totient is φ = 18107784576.

The previous prime is 18108059243. The next prime is 18108059261. The reversal of 18108059257 is 75295080181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11088300601 + 7019758656 = 105301^2 + 83784^2 .

It is a 3-Lehmer number, since φ(18108059257) divides (18108059257-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18108059257 is a prime.

It is a super-3 number, since 3×18108059257³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18108059227) 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, 27469 + ... + 192277.

It is an arithmetic number, because the mean of its divisors is an integer number (4527083485).

It is a Poulet number, since it divides 2^18108059256-1.

Almost surely, 2^18108059257 is an apocalyptic number.

18108059257 is the 109873-rd pentagonal number.

It is an amenable number.

18108059257 is a deficient number, since it is larger than the sum of its proper divisors (274683).

18108059257 is a wasteful number, since it uses less digits than its factorization.

18108059257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274682.

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 18108059257 in words is "eighteen billion, one hundred eight million, fifty-nine thousand, two hundred fifty-seven".