663801864 has 32 divisors (see below), whose sum is σ = 1810369440. Its totient is φ = 201152000.

The previous prime is 663801829. The next prime is 663801869. The reversal of 663801864 is 468108366.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (663801869) 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, 1256937 + ... + 1257464.

It is an arithmetic number, because the mean of its divisors is an integer number (56574045).

Almost surely, 2^663801864 is an apocalyptic number.

It is an amenable number.

663801864 is an abundant number, since it is smaller than the sum of its proper divisors (1146567576).

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

663801864 is a wasteful number, since it uses less digits than its factorization.

663801864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514421 (or 2514417 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 663801864 is about 25764.3525825898. The cubic root of 663801864 is about 872.3273502332.

The spelling of 663801864 in words is "six hundred sixty-three million, eight hundred one thousand, eight hundred sixty-four".