79671643636 has 36 divisors (see below), whose sum is σ = 151848320652. Its totient is φ = 36558921984.

The previous prime is 79671643631. The next prime is 79671643637. The reversal of 79671643636 is 63634617697.

It can be written as a sum of positive squares in 6 ways, for example, as 19796490000 + 59875153636 = 140700^2 + 244694^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79671643631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223681 + ... + 457576.

It is an arithmetic number, because the mean of its divisors is an integer number (4218008907).

Almost surely, 2^79671643636 is an apocalyptic number.

It is an amenable number.

79671643636 is a deficient number, since it is larger than the sum of its proper divisors (72176677016).

79671643636 is a wasteful number, since it uses less digits than its factorization.

79671643636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681460 (or 681445 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 58.

The spelling of 79671643636 in words is "seventy-nine billion, six hundred seventy-one million, six hundred forty-three thousand, six hundred thirty-six".