79440661 has 2 divisors, whose sum is σ = 79440662. Its totient is φ = 79440660.

The previous prime is 79440619. The next prime is 79440671. The reversal of 79440661 is 16604497.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56160036 + 23280625 = 7494^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 79440661 - 2⁹ = 79440149 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79440661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79440611) by changing a digit.

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, 39720330 + 39720331.

It is an arithmetic number, because the mean of its divisors is an integer number (39720331).

Almost surely, 2^79440661 is an apocalyptic number.

It is an amenable number.

79440661 is a deficient number, since it is larger than the sum of its proper divisors (1).

79440661 is an equidigital number, since it uses as much as digits as its factorization.

79440661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 79440661 is about 8912.9490630206. The cubic root of 79440661 is about 429.8803723469.

The spelling of 79440661 in words is "seventy-nine million, four hundred forty thousand, six hundred sixty-one".