663918360 has 64 divisors (see below), whose sum is σ = 2276294400. Its totient is φ = 151752576.

The previous prime is 663918347. The next prime is 663918361. The reversal of 663918360 is 63819366.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663918361) 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, 394350 + ... + 396029.

It is an arithmetic number, because the mean of its divisors is an integer number (35567100).

Almost surely, 2^663918360 is an apocalyptic number.

663918360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663918360 is an abundant number, since it is smaller than the sum of its proper divisors (1612376040).

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

663918360 is a wasteful number, since it uses less digits than its factorization.

663918360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790400 (or 790396 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 663918360 is about 25766.6132815316. The cubic root of 663918360 is about 872.3783778607.

The spelling of 663918360 in words is "six hundred sixty-three million, nine hundred eighteen thousand, three hundred sixty".