79818522551 has 2 divisors, whose sum is σ = 79818522552. Its totient is φ = 79818522550.

The previous prime is 79818522523. The next prime is 79818522557. The reversal of 79818522551 is 15522581897.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79818522551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79818522493 and 79818522502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79818522557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39909261275 + 39909261276.

It is an arithmetic number, because the mean of its divisors is an integer number (39909261276).

Almost surely, 2^79818522551 is an apocalyptic number.

79818522551 is a deficient number, since it is larger than the sum of its proper divisors (1).

79818522551 is an equidigital number, since it uses as much as digits as its factorization.

79818522551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016000, while the sum is 53.

The spelling of 79818522551 in words is "seventy-nine billion, eight hundred eighteen million, five hundred twenty-two thousand, five hundred fifty-one".