663409587918 has 48 divisors (see below), whose sum is σ = 1683755697024. Its totient is φ = 172314177840.

The previous prime is 663409587913. The next prime is 663409587977. The reversal of 663409587918 is 819785904366.

It is a super-2 number, since 2×663409587918² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663409587913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102564730 + ... + 102571197.

It is an arithmetic number, because the mean of its divisors is an integer number (35078243688).

Almost surely, 2^663409587918 is an apocalyptic number.

663409587918 is an abundant number, since it is smaller than the sum of its proper divisors (1020346109106).

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

663409587918 is a wasteful number, since it uses less digits than its factorization.

663409587918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205135957 (or 205135950 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 66.

The spelling of 663409587918 in words is "six hundred sixty-three billion, four hundred nine million, five hundred eighty-seven thousand, nine hundred eighteen".