79742640085 has 16 divisors (see below), whose sum is σ = 96404330736. Its totient is φ = 63319546368.

The previous prime is 79742640079. The next prime is 79742640091. The reversal of 79742640085 is 58004624797.

It is an interprime number because it is at equal distance from previous prime (79742640079) and next prime (79742640091).

It can be written as a sum of positive squares in 8 ways, for example, as 27905368401 + 51837271684 = 167049^2 + 227678^2 .

It is a cyclic number.

It is not a de Polignac number, because 79742640085 - 2¹³ = 79742631893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681339 + ... + 789751.

It is an arithmetic number, because the mean of its divisors is an integer number (6025270671).

Almost surely, 2^79742640085 is an apocalyptic number.

It is an amenable number.

79742640085 is a deficient number, since it is larger than the sum of its proper divisors (16661690651).

79742640085 is a wasteful number, since it uses less digits than its factorization.

79742640085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109512.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 79742640085 in words is "seventy-nine billion, seven hundred forty-two million, six hundred forty thousand, eighty-five".