79800078421 has 24 divisors (see below), whose sum is σ = 98692401024. Its totient is φ = 64191647520.

The previous prime is 79800078401. The next prime is 79800078433. The reversal of 79800078421 is 12487000897.

It is not a de Polignac number, because 79800078421 - 2¹¹ = 79800076373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79800078401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 608265 + ... + 727726.

It is an arithmetic number, because the mean of its divisors is an integer number (4112183376).

Almost surely, 2^79800078421 is an apocalyptic number.

It is an amenable number.

79800078421 is a deficient number, since it is larger than the sum of its proper divisors (18892322603).

79800078421 is a wasteful number, since it uses less digits than its factorization.

79800078421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336081 (or 1336074 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 79800078421 in words is "seventy-nine billion, eight hundred million, seventy-eight thousand, four hundred twenty-one".