663400581601076 has 24 divisors (see below), whose sum is σ = 1275603472809120. Its totient is φ = 299376325245600.

The previous prime is 663400581601061. The next prime is 663400581601099. The reversal of 663400581601076 is 670106185004366.

It is a super-2 number, since 2×663400581601076² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54234835415 + ... + 54234847646.

It is an arithmetic number, because the mean of its divisors is an integer number (53150144700380).

Almost surely, 2^{663400581601076} is an apocalyptic number.

It is an amenable number.

663400581601076 is a deficient number, since it is larger than the sum of its proper divisors (612202891208044).

663400581601076 is a wasteful number, since it uses less digits than its factorization.

663400581601076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108469683215 (or 108469683213 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 663400581601076 in words is "six hundred sixty-three trillion, four hundred billion, five hundred eighty-one million, six hundred one thousand, seventy-six".