79026185981 has 2 divisors, whose sum is σ = 79026185982. Its totient is φ = 79026185980.

The previous prime is 79026185977. The next prime is 79026186023. The reversal of 79026185981 is 18958162097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59357525956 + 19668660025 = 243634^2 + 140245^2 .

It is a cyclic number.

It is not a de Polignac number, because 79026185981 - 2² = 79026185977 is a prime.

It is a super-2 number, since 2×79026185981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79026185281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39513092990 + 39513092991.

It is an arithmetic number, because the mean of its divisors is an integer number (39513092991).

Almost surely, 2^79026185981 is an apocalyptic number.

It is an amenable number.

79026185981 is a deficient number, since it is larger than the sum of its proper divisors (1).

79026185981 is an equidigital number, since it uses as much as digits as its factorization.

79026185981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 79026185981 in words is "seventy-nine billion, twenty-six million, one hundred eighty-five thousand, nine hundred eighty-one".