72278537275013 has 4 divisors (see below), whose sum is σ = 73642283261388. Its totient is φ = 70914791288640.

The previous prime is 72278537275003. The next prime is 72278537275033. The reversal of 72278537275013 is 31057273587227.

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 59129225339809 + 13149311935204 = 7689553^2 + 3626198^2 .

It is a cyclic number.

It is not a de Polignac number, because 72278537275013 - 2⁴ = 72278537274997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72278537275003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681872993108 + ... + 681872993213.

It is an arithmetic number, because the mean of its divisors is an integer number (18410570815347).

Almost surely, 2^{72278537275013} is an apocalyptic number.

It is an amenable number.

72278537275013 is a deficient number, since it is larger than the sum of its proper divisors (1363745986375).

72278537275013 is a wasteful number, since it uses less digits than its factorization.

72278537275013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363745986374.

The product of its (nonzero) digits is 34574400, while the sum is 59.

The spelling of 72278537275013 in words is "seventy-two trillion, two hundred seventy-eight billion, five hundred thirty-seven million, two hundred seventy-five thousand, thirteen".