18467198640 has 640 divisors, whose sum is σ = 74052403200. Its totient is φ = 4185308160.

The previous prime is 18467198609. The next prime is 18467198657. The reversal of 18467198640 is 4689176481.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 25684201 + ... + 25684919.

It is an arithmetic number, because the mean of its divisors is an integer number (115706880).

Almost surely, 2^18467198640 is an apocalyptic number.

18467198640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18467198640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37026201600).

18467198640 is an abundant number, since it is smaller than the sum of its proper divisors (55585204560).

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

18467198640 is a wasteful number, since it uses less digits than its factorization.

18467198640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 18467198640 in words is "eighteen billion, four hundred sixty-seven million, one hundred ninety-eight thousand, six hundred forty".