663521982 has 16 divisors (see below), whose sum is σ = 1327575312. Its totient is φ = 221085440.

The previous prime is 663521977. The next prime is 663521987. The reversal of 663521982 is 289125366.

It is an interprime number because it is at equal distance from previous prime (663521977) and next prime (663521987).

It is a super-2 number, since 2×663521982² = 880522841194416648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663521987) 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, 4869 + ... + 36752.

It is an arithmetic number, because the mean of its divisors is an integer number (82973457).

Almost surely, 2^663521982 is an apocalyptic number.

663521982 is an abundant number, since it is smaller than the sum of its proper divisors (664053330).

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

663521982 is a wasteful number, since it uses less digits than its factorization.

663521982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44283.

The product of its digits is 155520, while the sum is 42.

The square root of 663521982 is about 25758.9204354530. The cubic root of 663521982 is about 872.2047317941.

The spelling of 663521982 in words is "six hundred sixty-three million, five hundred twenty-one thousand, nine hundred eighty-two".