629009666 has 4 divisors (see below), whose sum is σ = 943514502. Its totient is φ = 314504832.

The previous prime is 629009663. The next prime is 629009701. The reversal of 629009666 is 666900926.

It is a happy number.

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., 627753025 + 1256641 = 25055^2 + 1121^2 .

It is not an unprimeable number, because it can be changed into a prime (629009663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157252415 + ... + 157252418.

Almost surely, 2^629009666 is an apocalyptic number.

629009666 is a deficient number, since it is larger than the sum of its proper divisors (314504836).

629009666 is a wasteful number, since it uses less digits than its factorization.

629009666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314504835.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 629009666 is about 25080.0651115582. The cubic root of 629009666 is about 856.8124592180.

The spelling of 629009666 in words is "six hundred twenty-nine million, nine thousand, six hundred sixty-six".