79144451526221 has 4 divisors (see below), whose sum is σ = 79668586966944. Its totient is φ = 78620316085500.

The previous prime is 79144451526197. The next prime is 79144451526229. The reversal of 79144451526221 is 12262515444197.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79144451526221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79144451526229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262067720135 + ... + 262067720436.

It is an arithmetic number, because the mean of its divisors is an integer number (19917146741736).

Almost surely, 2^{79144451526221} is an apocalyptic number.

It is an amenable number.

79144451526221 is a deficient number, since it is larger than the sum of its proper divisors (524135440723).

79144451526221 is a wasteful number, since it uses less digits than its factorization.

79144451526221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524135440722.

The product of its digits is 4838400, while the sum is 53.

The spelling of 79144451526221 in words is "seventy-nine trillion, one hundred forty-four billion, four hundred fifty-one million, five hundred twenty-six thousand, two hundred twenty-one".