79148791649 has 2 divisors, whose sum is σ = 79148791650. Its totient is φ = 79148791648.

The previous prime is 79148791643. The next prime is 79148791651. The reversal of 79148791649 is 94619784197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78433603600 + 715188049 = 280060^2 + 26743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79148791649 is a prime.

Together with 79148791651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79148791643) 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, 39574395824 + 39574395825.

It is an arithmetic number, because the mean of its divisors is an integer number (39574395825).

Almost surely, 2^79148791649 is an apocalyptic number.

It is an amenable number.

79148791649 is a deficient number, since it is larger than the sum of its proper divisors (1).

79148791649 is an equidigital number, since it uses as much as digits as its factorization.

79148791649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 65.

The spelling of 79148791649 in words is "seventy-nine billion, one hundred forty-eight million, seven hundred ninety-one thousand, six hundred forty-nine".