612616666 has 4 divisors (see below), whose sum is σ = 918925002. Its totient is φ = 306308332.

The previous prime is 612616651. The next prime is 612616673. The reversal of 612616666 is 666616216.

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., 531994225 + 80622441 = 23065^2 + 8979^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153154165 + ... + 153154168.

Almost surely, 2^612616666 is an apocalyptic number.

612616666 is a deficient number, since it is larger than the sum of its proper divisors (306308336).

612616666 is a wasteful number, since it uses less digits than its factorization.

612616666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306308335.

The product of its digits is 93312, while the sum is 40.

The square root of 612616666 is about 24751.0942384372. The cubic root of 612616666 is about 849.3035430008.

The spelling of 612616666 in words is "six hundred twelve million, six hundred sixteen thousand, six hundred sixty-six".