623660555 has 24 divisors (see below), whose sum is σ = 908592288. Its totient is φ = 402490368.

The previous prime is 623660549. The next prime is 623660561. The reversal of 623660555 is 555066326.

It is an interprime number because it is at equal distance from previous prime (623660549) and next prime (623660561).

It is not a de Polignac number, because 623660555 - 2⁴ = 623660539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20714 + ... + 40943.

It is an arithmetic number, because the mean of its divisors is an integer number (37858012).

Almost surely, 2^623660555 is an apocalyptic number.

623660555 is a deficient number, since it is larger than the sum of its proper divisors (284931733).

623660555 is a wasteful number, since it uses less digits than its factorization.

623660555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61703 (or 61686 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 38.

The square root of 623660555 is about 24973.1967316962. The cubic root of 623660555 is about 854.3767581675.

The spelling of 623660555 in words is "six hundred twenty-three million, six hundred sixty thousand, five hundred fifty-five".