18640133331 has 16 divisors (see below), whose sum is σ = 26431305600. Its totient is φ = 11651344128.

The previous prime is 18640133329. The next prime is 18640133333. The reversal of 18640133331 is 13333104681.

It is an interprime number because it is at equal distance from previous prime (18640133329) and next prime (18640133333).

It is not a de Polignac number, because 18640133331 - 2¹ = 18640133329 is a prime.

It is a super-2 number, since 2×18640133331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18640133292 and 18640133301.

It is not an unprimeable number, because it can be changed into a prime (18640133333) 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, 1680141 + ... + 1691198.

It is an arithmetic number, because the mean of its divisors is an integer number (1651956600).

Almost surely, 2^18640133331 is an apocalyptic number.

18640133331 is a deficient number, since it is larger than the sum of its proper divisors (7791172269).

18640133331 is a wasteful number, since it uses less digits than its factorization.

18640133331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371458.

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 18640133331 in words is "eighteen billion, six hundred forty million, one hundred thirty-three thousand, three hundred thirty-one".