663697746 has 32 divisors (see below), whose sum is σ = 1483735680. Its totient is φ = 219904848.

The previous prime is 663697739. The next prime is 663697753. The reversal of 663697746 is 647796366.

It is an interprime number because it is at equal distance from previous prime (663697739) and next prime (663697753).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 663697692 and 663697701.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27781 + ... + 45816.

It is an arithmetic number, because the mean of its divisors is an integer number (46366740).

Almost surely, 2^663697746 is an apocalyptic number.

663697746 is an abundant number, since it is smaller than the sum of its proper divisors (820037934).

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

663697746 is a wasteful number, since it uses less digits than its factorization.

663697746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73775 (or 73769 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 54.

The square root of 663697746 is about 25762.3319208491. The cubic root of 663697746 is about 872.2817393699.

The spelling of 663697746 in words is "six hundred sixty-three million, six hundred ninety-seven thousand, seven hundred forty-six".