79641042217489 has 27 divisors (see below), whose sum is σ = 82013323022001. Its totient is φ = 77336255943360.

The previous prime is 79641042217483. The next prime is 79641042217493. The reversal of 79641042217489 is 98471224014697.

The square root of 79641042217489 is 8924183.

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

It can be written as a sum of positive squares in 4 ways, for example, as 54600025407489 + 25041016810000 = 7389183^2 + 5004100^2 .

It is not a de Polignac number, because 79641042217489 - 2⁷ = 79641042217361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79641042217489.

It is not an unprimeable number, because it can be changed into a prime (79641042217483) 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, 112328691067 + ... + 112328691775.

Almost surely, 2^{79641042217489} is an apocalyptic number.

79641042217489 is the 8924183-rd square number.

79641042217489 is the 4462092-nd centered octagonal number.

It is an amenable number.

79641042217489 is a deficient number, since it is larger than the sum of its proper divisors (2372280804512).

79641042217489 is an frugal number, since it uses more digits than its factorization.

79641042217489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 64.

The spelling of 79641042217489 in words is "seventy-nine trillion, six hundred forty-one billion, forty-two million, two hundred seventeen thousand, four hundred eighty-nine".