18265208240 has 20 divisors (see below), whose sum is σ = 42466609344. Its totient is φ = 7306083264.

The previous prime is 18265208239. The next prime is 18265208287. The reversal of 18265208240 is 4280256281.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18265208194 and 18265208203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114157472 + ... + 114157631.

Almost surely, 2^18265208240 is an apocalyptic number.

18265208240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18265208240 is an abundant number, since it is smaller than the sum of its proper divisors (24201401104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18265208240 is a wasteful number, since it uses less digits than its factorization.

18265208240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228315116 (or 228315110 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The spelling of 18265208240 in words is "eighteen billion, two hundred sixty-five million, two hundred eight thousand, two hundred forty".