72171984967 has 8 divisors (see below), whose sum is σ = 72322263936. Its totient is φ = 72021810432.

The previous prime is 72171984959. The next prime is 72171985021. The reversal of 72171984967 is 76948917127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72171984967 - 2³ = 72171984959 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 (72171984067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442523 + ... + 1491715.

It is an arithmetic number, because the mean of its divisors is an integer number (9040282992).

Almost surely, 2^72171984967 is an apocalyptic number.

72171984967 is a deficient number, since it is larger than the sum of its proper divisors (150278969).

72171984967 is a wasteful number, since it uses less digits than its factorization.

72171984967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52217.

The product of its digits is 10668672, while the sum is 61.

The spelling of 72171984967 in words is "seventy-two billion, one hundred seventy-one million, nine hundred eighty-four thousand, nine hundred sixty-seven".