72278537275015 has 4 divisors (see below), whose sum is σ = 86734244730024. Its totient is φ = 57822829820008.

The previous prime is 72278537275003. The next prime is 72278537275033. The reversal of 72278537275015 is 51057273587227.

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

It is a cyclic number.

It is not a de Polignac number, because 72278537275015 - 2¹¹ = 72278537272967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 7227853727497 + ... + 7227853727506.

It is an arithmetic number, because the mean of its divisors is an integer number (21683561182506).

Almost surely, 2^{72278537275015} is an apocalyptic number.

72278537275015 is a deficient number, since it is larger than the sum of its proper divisors (14455707455009).

72278537275015 is a wasteful number, since it uses less digits than its factorization.

72278537275015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14455707455008.

The product of its (nonzero) digits is 57624000, while the sum is 61.

The spelling of 72278537275015 in words is "seventy-two trillion, two hundred seventy-eight billion, five hundred thirty-seven million, two hundred seventy-five thousand, fifteen".