18208710231 has 16 divisors (see below), whose sum is σ = 24458112000. Its totient is φ = 12049430048.

The previous prime is 18208710193. The next prime is 18208710271. The reversal of 18208710231 is 13201780281.

It is a cyclic number.

It is not a de Polignac number, because 18208710231 - 2⁹ = 18208709719 is a prime.

It is a super-2 number, since 2×18208710231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18208710192 and 18208710201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18208710271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334945 + ... + 385493.

It is an arithmetic number, because the mean of its divisors is an integer number (1528632000).

Almost surely, 2^18208710231 is an apocalyptic number.

18208710231 is a deficient number, since it is larger than the sum of its proper divisors (6249401769).

18208710231 is a wasteful number, since it uses less digits than its factorization.

18208710231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51438.

The product of its (nonzero) digits is 5376, while the sum is 33.

The spelling of 18208710231 in words is "eighteen billion, two hundred eight million, seven hundred ten thousand, two hundred thirty-one".