79991000253 has 96 divisors (see below), whose sum is σ = 124965335040. Its totient is φ = 51103016640.

The previous prime is 79991000231. The next prime is 79991000261. The reversal of 79991000253 is 35200019997.

It is a happy number.

79991000253 is a nontrivial binomial coefficient, being equal to C(399978, 2).

It is not a de Polignac number, because 79991000253 - 2⁶ = 79991000189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79991000199 and 79991000208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79991000203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 97194000 + ... + 97194822.

It is an arithmetic number, because the mean of its divisors is an integer number (1301722240).

Almost surely, 2^79991000253 is an apocalyptic number.

79991000253 is the 399977-th triangular number and also the 199989-th hexagonal number.

It is an amenable number.

79991000253 is a deficient number, since it is larger than the sum of its proper divisors (44974334787).

79991000253 is an equidigital number, since it uses as much as digits as its factorization.

79991000253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The spelling of 79991000253 in words is "seventy-nine billion, nine hundred ninety-one million, two hundred fifty-three", and thus it is an aban number.