663622555 has 4 divisors (see below), whose sum is σ = 796347072. Its totient is φ = 530898040.

The previous prime is 663622543. The next prime is 663622567. The reversal of 663622555 is 555226366.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (663622543) and next prime (663622567).

It is not a de Polignac number, because 663622555 - 2¹⁷ = 663491483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66362251 + ... + 66362260.

It is an arithmetic number, because the mean of its divisors is an integer number (199086768).

Almost surely, 2^663622555 is an apocalyptic number.

663622555 is a deficient number, since it is larger than the sum of its proper divisors (132724517).

663622555 is a wasteful number, since it uses less digits than its factorization.

663622555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132724516.

The product of its digits is 324000, while the sum is 40.

The square root of 663622555 is about 25760.8725589798. The cubic root of 663622555 is about 872.2487975609.

The spelling of 663622555 in words is "six hundred sixty-three million, six hundred twenty-two thousand, five hundred fifty-five".