726271561091 has 4 divisors (see below), whose sum is σ = 734431915800. Its totient is φ = 718111206384.

The previous prime is 726271561069. The next prime is 726271561111. The reversal of 726271561091 is 190165172627.

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 726271561091 - 2³⁴ = 709091691907 is a prime.

It is a super-2 number, since 2×726271561091² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726271561291) 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, 4080177221 + ... + 4080177398.

It is an arithmetic number, because the mean of its divisors is an integer number (183607978950).

Almost surely, 2^726271561091 is an apocalyptic number.

726271561091 is a deficient number, since it is larger than the sum of its proper divisors (8160354709).

726271561091 is an equidigital number, since it uses as much as digits as its factorization.

726271561091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8160354708.

The product of its (nonzero) digits is 317520, while the sum is 47.

The spelling of 726271561091 in words is "seven hundred twenty-six billion, two hundred seventy-one million, five hundred sixty-one thousand, ninety-one".