623306666 has 16 divisors (see below), whose sum is σ = 1042061760. Its totient is φ = 277882560.

The previous prime is 623306633. The next prime is 623306669. The reversal of 623306666 is 666603326.

It is a super-2 number, since 2×623306666² = 777022399760071112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (623306669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481790 + ... + 483081.

It is an arithmetic number, because the mean of its divisors is an integer number (65128860).

Almost surely, 2^623306666 is an apocalyptic number.

623306666 is a deficient number, since it is larger than the sum of its proper divisors (418755094).

623306666 is a wasteful number, since it uses less digits than its factorization.

623306666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964909.

The product of its (nonzero) digits is 139968, while the sum is 38.

The square root of 623306666 is about 24966.1103498322. The cubic root of 623306666 is about 854.2151255072.

The spelling of 623306666 in words is "six hundred twenty-three million, three hundred six thousand, six hundred sixty-six".