79774072605 has 12 divisors (see below), whose sum is σ = 138275059260. Its totient is φ = 42546172032.

The previous prime is 79774072601. The next prime is 79774072621. The reversal of 79774072605 is 50627047797.

It can be written as a sum of positive squares in 2 ways, for example, as 22279144644 + 57494927961 = 149262^2 + 239781^2 .

It is not a de Polignac number, because 79774072605 - 2² = 79774072601 is a prime.

It is a super-2 number, since 2×79774072605² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79774072601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 886378540 + ... + 886378629.

It is an arithmetic number, because the mean of its divisors is an integer number (11522921605).

Almost surely, 2^79774072605 is an apocalyptic number.

It is an amenable number.

79774072605 is a deficient number, since it is larger than the sum of its proper divisors (58500986655).

79774072605 is a wasteful number, since it uses less digits than its factorization.

79774072605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772757180 (or 1772757177 counting only the distinct ones).

The product of its (nonzero) digits is 5186160, while the sum is 54.

The spelling of 79774072605 in words is "seventy-nine billion, seven hundred seventy-four million, seventy-two thousand, six hundred five".