663916954 has 4 divisors (see below), whose sum is σ = 995875434. Its totient is φ = 331958476.

The previous prime is 663916931. The next prime is 663916961. The reversal of 663916954 is 459619366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 459619366 = 2 ⋅229809683.

It can be written as a sum of positive squares in only one way, i.e., 436601025 + 227315929 = 20895^2 + 15077^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 663916898 and 663916907.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165979237 + ... + 165979240.

Almost surely, 2^663916954 is an apocalyptic number.

663916954 is a deficient number, since it is larger than the sum of its proper divisors (331958480).

663916954 is a wasteful number, since it uses less digits than its factorization.

663916954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331958479.

The product of its digits is 1049760, while the sum is 49.

The square root of 663916954 is about 25766.5859981488. The cubic root of 663916954 is about 872.3777620395.

The spelling of 663916954 in words is "six hundred sixty-three million, nine hundred sixteen thousand, nine hundred fifty-four".