79644570058621 has 2 divisors, whose sum is σ = 79644570058622. Its totient is φ = 79644570058620.

The previous prime is 79644570058597. The next prime is 79644570058631. The reversal of 79644570058621 is 12685007544697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43922563308100 + 35722006750521 = 6627410^2 + 5976789^2 .

It is a cyclic number.

It is not a de Polignac number, because 79644570058621 - 2⁵ = 79644570058589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79644570058631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39822285029310 + 39822285029311.

It is an arithmetic number, because the mean of its divisors is an integer number (39822285029311).

Almost surely, 2^{79644570058621} is an apocalyptic number.

It is an amenable number.

79644570058621 is a deficient number, since it is larger than the sum of its proper divisors (1).

79644570058621 is an equidigital number, since it uses as much as digits as its factorization.

79644570058621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 101606400, while the sum is 64.

The spelling of 79644570058621 in words is "seventy-nine trillion, six hundred forty-four billion, five hundred seventy million, fifty-eight thousand, six hundred twenty-one".