72442345081 has 4 divisors (see below), whose sum is σ = 72494128000. Its totient is φ = 72390562164.

The previous prime is 72442345061. The next prime is 72442345091. The reversal of 72442345081 is 18054324427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72442345081 - 2¹⁹ = 72441820793 is a prime.

It is a super-2 number, since 2×72442345081² (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 (72442345061) 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, 25889361 + ... + 25892158.

It is an arithmetic number, because the mean of its divisors is an integer number (18123532000).

Almost surely, 2^72442345081 is an apocalyptic number.

It is an amenable number.

72442345081 is a deficient number, since it is larger than the sum of its proper divisors (51782919).

72442345081 is a wasteful number, since it uses less digits than its factorization.

72442345081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51782918.

The product of its (nonzero) digits is 215040, while the sum is 40.

The spelling of 72442345081 in words is "seventy-two billion, four hundred forty-two million, three hundred forty-five thousand, eighty-one".