72178968215 has 4 divisors (see below), whose sum is σ = 86614761864. Its totient is φ = 57743174568.

The previous prime is 72178968193. The next prime is 72178968241. The reversal of 72178968215 is 51286987127.

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 72178968215 - 2¹² = 72178964119 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, 7217896817 + ... + 7217896826.

It is an arithmetic number, because the mean of its divisors is an integer number (21653690466).

Almost surely, 2^72178968215 is an apocalyptic number.

72178968215 is a deficient number, since it is larger than the sum of its proper divisors (14435793649).

72178968215 is a wasteful number, since it uses less digits than its factorization.

72178968215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14435793648.

The product of its digits is 3386880, while the sum is 56.

The spelling of 72178968215 in words is "seventy-two billion, one hundred seventy-eight million, nine hundred sixty-eight thousand, two hundred fifteen".