79621756999 has 2 divisors, whose sum is σ = 79621757000. Its totient is φ = 79621756998.

The previous prime is 79621756997. The next prime is 79621757051. The reversal of 79621756999 is 99965712697.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79621756999 - 2¹ = 79621756997 is a prime.

Together with 79621756997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79621756997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39810878499 + 39810878500.

It is an arithmetic number, because the mean of its divisors is an integer number (39810878500).

Almost surely, 2^79621756999 is an apocalyptic number.

79621756999 is a deficient number, since it is larger than the sum of its proper divisors (1).

79621756999 is an equidigital number, since it uses as much as digits as its factorization.

79621756999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115736040, while the sum is 70.

The spelling of 79621756999 in words is "seventy-nine billion, six hundred twenty-one million, seven hundred fifty-six thousand, nine hundred ninety-nine".