663945042 has 16 divisors (see below), whose sum is σ = 1370725632. Its totient is φ = 214175760.

The previous prime is 663945041. The next prime is 663945059. The reversal of 663945042 is 240549366.

It is not an unprimeable number, because it can be changed into a prime (663945041) 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, 1784613 + ... + 1784984.

It is an arithmetic number, because the mean of its divisors is an integer number (85670352).

Almost surely, 2^663945042 is an apocalyptic number.

663945042 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

663945042 is an abundant number, since it is smaller than the sum of its proper divisors (706780590).

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

663945042 is a wasteful number, since it uses less digits than its factorization.

663945042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569633.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 663945042 is about 25767.1310393687. The cubic root of 663945042 is about 872.3900642815.

It can be divided in two parts, 6639 and 45042, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 663945042 in words is "six hundred sixty-three million, nine hundred forty-five thousand, forty-two".