72136741291 has 4 divisors (see below), whose sum is σ = 76380079032. Its totient is φ = 67893403552.

The previous prime is 72136741279. The next prime is 72136741297. The reversal of 72136741291 is 19214763127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72136741291 - 2²¹ = 72134644139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72136741297) 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, 2121668845 + ... + 2121668878.

It is an arithmetic number, because the mean of its divisors is an integer number (19095019758).

Almost surely, 2^72136741291 is an apocalyptic number.

72136741291 is a deficient number, since it is larger than the sum of its proper divisors (4243337741).

72136741291 is a wasteful number, since it uses less digits than its factorization.

72136741291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243337740.

The product of its digits is 127008, while the sum is 43.

The spelling of 72136741291 in words is "seventy-two billion, one hundred thirty-six million, seven hundred forty-one thousand, two hundred ninety-one".