79879237649 has 4 divisors (see below), whose sum is σ = 81827511780. Its totient is φ = 77930963520.

The previous prime is 79879237643. The next prime is 79879237661. The reversal of 79879237649 is 94673297897.

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 3665697025 + 76213540624 = 60545^2 + 276068^2 .

It is a cyclic number.

It is not a de Polignac number, because 79879237649 - 2⁸ = 79879237393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79879237643) 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, 974137004 + ... + 974137085.

It is an arithmetic number, because the mean of its divisors is an integer number (20456877945).

Almost surely, 2^79879237649 is an apocalyptic number.

It is an amenable number.

79879237649 is a deficient number, since it is larger than the sum of its proper divisors (1948274131).

79879237649 is a wasteful number, since it uses less digits than its factorization.

79879237649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948274130.

The product of its digits is 288054144, while the sum is 71.

The spelling of 79879237649 in words is "seventy-nine billion, eight hundred seventy-nine million, two hundred thirty-seven thousand, six hundred forty-nine".