79800661 has 2 divisors, whose sum is σ = 79800662. Its totient is φ = 79800660.

The previous prime is 79800641. The next prime is 79800671. The reversal of 79800661 is 16600897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44635761 + 35164900 = 6681^2 + 5930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79800661 is a prime.

It is equal to p_4658473 and since 79800661 and 4658473 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79800661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79800641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39900330 + 39900331.

It is an arithmetic number, because the mean of its divisors is an integer number (39900331).

Almost surely, 2^79800661 is an apocalyptic number.

It is an amenable number.

79800661 is a deficient number, since it is larger than the sum of its proper divisors (1).

79800661 is an equidigital number, since it uses as much as digits as its factorization.

79800661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 79800661 is about 8933.1215708732. The cubic root of 79800661 is about 430.5287546279.

The spelling of 79800661 in words is "seventy-nine million, eight hundred thousand, six hundred sixty-one".