72243336561 has 32 divisors (see below), whose sum is σ = 111884198400. Its totient is φ = 40978049280.

The previous prime is 72243336547. The next prime is 72243336563. The reversal of 72243336561 is 16563334227.

It is not a de Polignac number, because 72243336561 - 2¹⁰ = 72243335537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72243336563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259291 + ... + 460128.

It is an arithmetic number, because the mean of its divisors is an integer number (3496381200).

Almost surely, 2^72243336561 is an apocalyptic number.

It is an amenable number.

72243336561 is a deficient number, since it is larger than the sum of its proper divisors (39640861839).

72243336561 is a wasteful number, since it uses less digits than its factorization.

72243336561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719629.

The product of its digits is 544320, while the sum is 42.

It can be divided in two parts, 72243 and 336561, that added together give a palindrome (408804).

The spelling of 72243336561 in words is "seventy-two billion, two hundred forty-three million, three hundred thirty-six thousand, five hundred sixty-one".