18408240016 has 20 divisors (see below), whose sum is σ = 37763963532. Its totient is φ = 8662701056.

The previous prime is 18408239989. The next prime is 18408240023. The reversal of 18408240016 is 61004280481.

It can be written as a sum of positive squares in 2 ways, for example, as 9176873616 + 9231366400 = 95796^2 + 96080^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 33838405 + ... + 33838948.

Almost surely, 2^18408240016 is an apocalyptic number.

18408240016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18408240016 is an abundant number, since it is smaller than the sum of its proper divisors (19355723516).

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

18408240016 is a wasteful number, since it uses less digits than its factorization.

18408240016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67677378 (or 67677372 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The spelling of 18408240016 in words is "eighteen billion, four hundred eight million, two hundred forty thousand, sixteen".