634187666 has 8 divisors (see below), whose sum is σ = 1087178880. Its totient is φ = 271794708.

The previous prime is 634187663. The next prime is 634187699. The reversal of 634187666 is 666781436.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 634187666.

It is not an unprimeable number, because it can be changed into a prime (634187663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22649546 + ... + 22649573.

It is an arithmetic number, because the mean of its divisors is an integer number (135897360).

Almost surely, 2^634187666 is an apocalyptic number.

634187666 is a deficient number, since it is larger than the sum of its proper divisors (452991214).

634187666 is a wasteful number, since it uses less digits than its factorization.

634187666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45299128.

The product of its digits is 870912, while the sum is 47.

The square root of 634187666 is about 25183.0829327944. The cubic root of 634187666 is about 859.1571271306.

The spelling of 634187666 in words is "six hundred thirty-four million, one hundred eighty-seven thousand, six hundred sixty-six".