661166612 has 6 divisors (see below), whose sum is σ = 1157041578. Its totient is φ = 330583304.

The previous prime is 661166609. The next prime is 661166633. The reversal of 661166612 is 216661166.

It can be written as a sum of positive squares in only one way, i.e., 513203716 + 147962896 = 22654^2 + 12164^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 82645823 + ... + 82645830.

It is an arithmetic number, because the mean of its divisors is an integer number (192840263).

Almost surely, 2^661166612 is an apocalyptic number.

It is an amenable number.

661166612 is a deficient number, since it is larger than the sum of its proper divisors (495874966).

661166612 is a wasteful number, since it uses less digits than its factorization.

661166612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165291657 (or 165291655 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 661166612 is about 25713.1602880704. The cubic root of 661166612 is about 871.1714575488.

The spelling of 661166612 in words is "six hundred sixty-one million, one hundred sixty-six thousand, six hundred twelve".