18168970440 has 64 divisors (see below), whose sum is σ = 54530496000. Its totient is φ = 4842962432.

The previous prime is 18168970423. The next prime is 18168970459. The reversal of 18168970440 is 4407986181.

It is a super-2 number, since 2×18168970440² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18168970440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256324 + ... + 319436.

It is an arithmetic number, because the mean of its divisors is an integer number (852039000).

Almost surely, 2^18168970440 is an apocalyptic number.

18168970440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18168970440 is an abundant number, since it is smaller than the sum of its proper divisors (36361525560).

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

18168970440 is a wasteful number, since it uses less digits than its factorization.

18168970440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65526 (or 65522 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 18168970440 in words is "eighteen billion, one hundred sixty-eight million, nine hundred seventy thousand, four hundred forty".