79774890985 has 4 divisors (see below), whose sum is σ = 95729869188. Its totient is φ = 63819912784.

The previous prime is 79774890973. The next prime is 79774891057. The reversal of 79774890985 is 58909847797.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12492756441 + 67282134544 = 111771^2 + 259388^2 .

It is a cyclic number.

It is not a de Polignac number, because 79774890985 - 2¹¹ = 79774888937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7977489094 + ... + 7977489103.

It is an arithmetic number, because the mean of its divisors is an integer number (23932467297).

Almost surely, 2^79774890985 is an apocalyptic number.

It is an amenable number.

79774890985 is a deficient number, since it is larger than the sum of its proper divisors (15954978203).

79774890985 is a wasteful number, since it uses less digits than its factorization.

79774890985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15954978202.

The product of its (nonzero) digits is 320060160, while the sum is 73.

The spelling of 79774890985 in words is "seventy-nine billion, seven hundred seventy-four million, eight hundred ninety thousand, nine hundred eighty-five".