663611440 has 40 divisors (see below), whose sum is σ = 1564640928. Its totient is φ = 261703680.

The previous prime is 663611419. The next prime is 663611441. The reversal of 663611440 is 44116366.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (663611441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52737 + ... + 64096.

Almost surely, 2^663611440 is an apocalyptic number.

It is an amenable number.

663611440 is an abundant number, since it is smaller than the sum of its proper divisors (901029488).

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

663611440 is a wasteful number, since it uses less digits than its factorization.

663611440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116917 (or 116911 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 663611440 is about 25760.6568239243. The cubic root of 663611440 is about 872.2439277749.

The spelling of 663611440 in words is "six hundred sixty-three million, six hundred eleven thousand, four hundred forty".