72311773331 has 8 divisors (see below), whose sum is σ = 83245254240. Its totient is φ = 61529099328.

The previous prime is 72311773309. The next prime is 72311773379. The reversal of 72311773331 is 13337711327.

It is a happy number.

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 72311773331 - 2¹⁴ = 72311756947 is a prime.

It is a super-2 number, since 2×72311773331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72311773031) 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, 37700696 + ... + 37702613.

It is an arithmetic number, because the mean of its divisors is an integer number (10405656780).

Almost surely, 2^72311773331 is an apocalyptic number.

72311773331 is a deficient number, since it is larger than the sum of its proper divisors (10933480909).

72311773331 is a wasteful number, since it uses less digits than its factorization.

72311773331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75403453.

The product of its digits is 55566, while the sum is 38.

The spelling of 72311773331 in words is "seventy-two billion, three hundred eleven million, seven hundred seventy-three thousand, three hundred thirty-one".