78712133281 has 4 divisors (see below), whose sum is σ = 78715776132. Its totient is φ = 78708490432.

The previous prime is 78712133231. The next prime is 78712133333. The reversal of 78712133281 is 18233121787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33519751056 + 45192382225 = 183084^2 + 212585^2 .

It is a cyclic number.

It is not a de Polignac number, because 78712133281 - 2⁷ = 78712133153 is a prime.

It is a super-2 number, since 2×78712133281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78712133231) 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 3 ways as a sum of consecutive naturals, for example, 1788820 + ... + 1832293.

It is an arithmetic number, because the mean of its divisors is an integer number (19678944033).

Almost surely, 2^78712133281 is an apocalyptic number.

It is an amenable number.

78712133281 is a deficient number, since it is larger than the sum of its proper divisors (3642851).

78712133281 is a wasteful number, since it uses less digits than its factorization.

78712133281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642850.

The product of its digits is 112896, while the sum is 43.

The spelling of 78712133281 in words is "seventy-eight billion, seven hundred twelve million, one hundred thirty-three thousand, two hundred eighty-one".