663899442 has 16 divisors (see below), whose sum is σ = 1328084640. Its totient is φ = 221252192.

The previous prime is 663899413. The next prime is 663899443. The reversal of 663899442 is 244998366.

It is a super-2 number, since 2×663899442² = 881524938175822728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663899443) 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, 29233 + ... + 46715.

It is an arithmetic number, because the mean of its divisors is an integer number (83005290).

Almost surely, 2^663899442 is an apocalyptic number.

663899442 is an abundant number, since it is smaller than the sum of its proper divisors (664185198).

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

663899442 is a wasteful number, since it uses less digits than its factorization.

663899442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23817.

The product of its digits is 2239488, while the sum is 51.

The square root of 663899442 is about 25766.2461759566. The cubic root of 663899442 is about 872.3700917962.

The spelling of 663899442 in words is "six hundred sixty-three million, eight hundred ninety-nine thousand, four hundred forty-two".