612918666 has 12 divisors (see below), whose sum is σ = 1327990482. Its totient is φ = 204306216.

The previous prime is 612918643. The next prime is 612918673. The reversal of 612918666 is 666819216.

It can be written as a sum of positive squares in only one way, i.e., 546577641 + 66341025 = 23379^2 + 8145^2 .

It is a super-2 number, since 2×612918666² = 751338582262439112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17025501 + ... + 17025536.

Almost surely, 2^612918666 is an apocalyptic number.

612918666 is an abundant number, since it is smaller than the sum of its proper divisors (715071816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

612918666 is a wasteful number, since it uses less digits than its factorization.

612918666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34051045 (or 34051042 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 612918666 is about 24757.1942271333. The cubic root of 612918666 is about 849.4430797067.

The spelling of 612918666 in words is "six hundred twelve million, nine hundred eighteen thousand, six hundred sixty-six".