79566666653 has 2 divisors, whose sum is σ = 79566666654. Its totient is φ = 79566666652.

The previous prime is 79566666631. The next prime is 79566666701. The reversal of 79566666653 is 35666666597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50022900964 + 29543765689 = 223658^2 + 171883^2 .

It is a cyclic number.

It is not a de Polignac number, because 79566666653 - 2⁶ = 79566666589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79566666653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79566666353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39783333326 + 39783333327.

It is an arithmetic number, because the mean of its divisors is an integer number (39783333327).

Almost surely, 2^79566666653 is an apocalyptic number.

It is an amenable number.

79566666653 is a deficient number, since it is larger than the sum of its proper divisors (1).

79566666653 is an equidigital number, since it uses as much as digits as its factorization.

79566666653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 220449600, while the sum is 65.

The spelling of 79566666653 in words is "seventy-nine billion, five hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-three".