79905911653 has 2 divisors, whose sum is σ = 79905911654. Its totient is φ = 79905911652.

The previous prime is 79905911623. The next prime is 79905911663. The reversal of 79905911653 is 35611950997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79897806244 + 8105409 = 282662^2 + 2847^2 .

It is a cyclic number.

It is not a de Polignac number, because 79905911653 - 2¹³ = 79905903461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79905911594 and 79905911603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79905911623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39952955826 + 39952955827.

It is an arithmetic number, because the mean of its divisors is an integer number (39952955827).

Almost surely, 2^79905911653 is an apocalyptic number.

It is an amenable number.

79905911653 is a deficient number, since it is larger than the sum of its proper divisors (1).

79905911653 is an equidigital number, since it uses as much as digits as its factorization.

79905911653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2296350, while the sum is 55.

The spelling of 79905911653 in words is "seventy-nine billion, nine hundred five million, nine hundred eleven thousand, six hundred fifty-three".