7979979653 has 2 divisors, whose sum is σ = 7979979654. Its totient is φ = 7979979652.

The previous prime is 7979979649. The next prime is 7979979671. The reversal of 7979979653 is 3569799797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7967883169 + 12096484 = 89263^2 + 3478^2 .

It is an emirp because it is prime and its reverse (3569799797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7979979653 - 2² = 7979979649 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7979979253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989989826 + 3989989827.

It is an arithmetic number, because the mean of its divisors is an integer number (3989989827).

Almost surely, 2^7979979653 is an apocalyptic number.

It is an amenable number.

7979979653 is a deficient number, since it is larger than the sum of its proper divisors (1).

7979979653 is an equidigital number, since it uses as much as digits as its factorization.

7979979653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 202538070, while the sum is 71.

The square root of 7979979653 is about 89330.7318508026. The cubic root of 7979979653 is about 1998.3302440956.

The spelling of 7979979653 in words is "seven billion, nine hundred seventy-nine million, nine hundred seventy-nine thousand, six hundred fifty-three".