79366721841 has 27 divisors (see below), whose sum is σ = 126024920203. Its totient is φ = 48095409120.

The previous prime is 79366721839. The next prime is 79366721843. The reversal of 79366721841 is 14812766397.

The square root of 79366721841 is 281721.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (79366721839) and next prime (79366721843).

It can be written as a sum of positive squares in only one way, i.e., 70132280625 + 9234441216 = 264825^2 + 96096^2 .

It is not a de Polignac number, because 79366721841 - 2¹ = 79366721839 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79366721843) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9292525 + ... + 9301061.

Almost surely, 2^79366721841 is an apocalyptic number.

79366721841 is the 281721-st square number.

79366721841 is the 140861-st centered octagonal number.

It is an amenable number.

79366721841 is a deficient number, since it is larger than the sum of its proper divisors (46658198362).

79366721841 is an frugal number, since it uses more digits than its factorization.

79366721841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17102 (or 8551 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 79366721841 in words is "seventy-nine billion, three hundred sixty-six million, seven hundred twenty-one thousand, eight hundred forty-one".