72216720967 has 4 divisors (see below), whose sum is σ = 72473720256. Its totient is φ = 71959721680.

The previous prime is 72216720941. The next prime is 72216720977. The reversal of 72216720967 is 76902761227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76902761227 = 3923 ⋅19603049.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72216720967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72216720967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72216720977) 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, 128499223 + ... + 128499784.

It is an arithmetic number, because the mean of its divisors is an integer number (18118430064).

Almost surely, 2^72216720967 is an apocalyptic number.

72216720967 is a deficient number, since it is larger than the sum of its proper divisors (256999289).

72216720967 is a wasteful number, since it uses less digits than its factorization.

72216720967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256999288.

The product of its (nonzero) digits is 889056, while the sum is 49.

The spelling of 72216720967 in words is "seventy-two billion, two hundred sixteen million, seven hundred twenty thousand, nine hundred sixty-seven".