79802550889 has 4 divisors (see below), whose sum is σ = 79804012356. Its totient is φ = 79801089424.

The previous prime is 79802550887. The next prime is 79802550899. The reversal of 79802550889 is 98805520897.

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 71649905625 + 8152645264 = 267675^2 + 90292^2 .

It is a cyclic number.

It is not a de Polignac number, because 79802550889 - 2¹ = 79802550887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79802550881) 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, 645514 + ... + 759139.

It is an arithmetic number, because the mean of its divisors is an integer number (19951003089).

Almost surely, 2^79802550889 is an apocalyptic number.

It is an amenable number.

79802550889 is a deficient number, since it is larger than the sum of its proper divisors (1461467).

79802550889 is a wasteful number, since it uses less digits than its factorization.

79802550889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461466.

The product of its (nonzero) digits is 14515200, while the sum is 61.

The spelling of 79802550889 in words is "seventy-nine billion, eight hundred two million, five hundred fifty thousand, eight hundred eighty-nine".