79538771849 has 8 divisors (see below), whose sum is σ = 80169736008. Its totient is φ = 78908538240.

The previous prime is 79538771839. The next prime is 79538771911. The reversal of 79538771849 is 94817783597.

It can be written as a sum of positive squares in 4 ways, for example, as 13471780624 + 66066991225 = 116068^2 + 257035^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79538771849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79538771839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37019 + ... + 400559.

It is an arithmetic number, because the mean of its divisors is an integer number (10021217001).

Almost surely, 2^79538771849 is an apocalyptic number.

It is an amenable number.

79538771849 is a deficient number, since it is larger than the sum of its proper divisors (630964159).

79538771849 is a wasteful number, since it uses less digits than its factorization.

79538771849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365275.

The product of its digits is 106686720, while the sum is 68.

The spelling of 79538771849 in words is "seventy-nine billion, five hundred thirty-eight million, seven hundred seventy-one thousand, eight hundred forty-nine".