630766666 has 4 divisors (see below), whose sum is σ = 946150002. Its totient is φ = 315383332.

The previous prime is 630766663. The next prime is 630766667. The reversal of 630766666 is 666667036.

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

It can be written as a sum of positive squares in only one way, i.e., 504676225 + 126090441 = 22465^2 + 11229^2 .

It is not an unprimeable number, because it can be changed into a prime (630766663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157691665 + ... + 157691668.

Almost surely, 2^630766666 is an apocalyptic number.

630766666 is a deficient number, since it is larger than the sum of its proper divisors (315383336).

630766666 is a wasteful number, since it uses less digits than its factorization.

630766666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315383335.

The product of its (nonzero) digits is 979776, while the sum is 46.

The square root of 630766666 is about 25115.0685047841. The cubic root of 630766666 is about 857.6094898824.

The spelling of 630766666 in words is "six hundred thirty million, seven hundred sixty-six thousand, six hundred sixty-six".