663690955 has 8 divisors (see below), whose sum is σ = 823892400. Its totient is φ = 512643936.

The previous prime is 663690949. The next prime is 663690971. The reversal of 663690955 is 559096366.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663690955 - 2¹³ = 663682763 is a prime.

It is a super-3 number, since 3×663690955³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 663690899 and 663690908.

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, 2288445 + ... + 2288734.

It is an arithmetic number, because the mean of its divisors is an integer number (102986550).

Almost surely, 2^663690955 is an apocalyptic number.

663690955 is a deficient number, since it is larger than the sum of its proper divisors (160201445).

663690955 is a wasteful number, since it uses less digits than its factorization.

663690955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4577213.

The product of its (nonzero) digits is 1312200, while the sum is 49.

The square root of 663690955 is about 25762.2001195550. The cubic root of 663690955 is about 872.2787642780.

The spelling of 663690955 in words is "six hundred sixty-three million, six hundred ninety thousand, nine hundred fifty-five".