72908163991 has 16 divisors (see below), whose sum is σ = 83068524000. Its totient is φ = 63434060928.

The previous prime is 72908163961. The next prime is 72908164001. The reversal of 72908163991 is 19936180927.

It is a cyclic number.

It is not a de Polignac number, because 72908163991 - 2¹¹ = 72908161943 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 (72908163931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700516 + ... + 797833.

It is an arithmetic number, because the mean of its divisors is an integer number (5191782750).

Almost surely, 2^72908163991 is an apocalyptic number.

72908163991 is a deficient number, since it is larger than the sum of its proper divisors (10160360009).

72908163991 is a wasteful number, since it uses less digits than its factorization.

72908163991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498578.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 72908163991 in words is "seventy-two billion, nine hundred eight million, one hundred sixty-three thousand, nine hundred ninety-one".