612981866 has 12 divisors (see below), whose sum is σ = 1069590978. Its totient is φ = 262706472.

The previous prime is 612981829. The next prime is 612981907. The reversal of 612981866 is 668189216.

It can be written as a sum of positive squares in only one way, i.e., 565440841 + 47541025 = 23779^2 + 6895^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 612981866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3127361 + ... + 3127556.

Almost surely, 2^612981866 is an apocalyptic number.

612981866 is a deficient number, since it is larger than the sum of its proper divisors (456609112).

612981866 is a wasteful number, since it uses less digits than its factorization.

612981866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6254933 (or 6254926 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 612981866 is about 24758.4705908907. The cubic root of 612981866 is about 849.4722749656.

The spelling of 612981866 in words is "six hundred twelve million, nine hundred eighty-one thousand, eight hundred sixty-six".