79975667777 has 2 divisors, whose sum is σ = 79975667778. Its totient is φ = 79975667776.

The previous prime is 79975667773. The next prime is 79975667803. The reversal of 79975667777 is 77776657997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67667096641 + 12308571136 = 260129^2 + 110944^2 .

It is a cyclic number.

It is not a de Polignac number, because 79975667777 - 2² = 79975667773 is a prime.

It is a super-2 number, since 2×79975667777² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 79975667698 and 79975667707.

It is not a weakly prime, because it can be changed into another prime (79975667773) 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, 39987833888 + 39987833889.

It is an arithmetic number, because the mean of its divisors is an integer number (39987833889).

Almost surely, 2^79975667777 is an apocalyptic number.

It is an amenable number.

79975667777 is a deficient number, since it is larger than the sum of its proper divisors (1).

79975667777 is an equidigital number, since it uses as much as digits as its factorization.

79975667777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1715322420, while the sum is 77.

The spelling of 79975667777 in words is "seventy-nine billion, nine hundred seventy-five million, six hundred sixty-seven thousand, seven hundred seventy-seven".