726638926691 has 8 divisors (see below), whose sum is σ = 745411732800. Its totient is φ = 707916116160.

The previous prime is 726638926681. The next prime is 726638926723. The reversal of 726638926691 is 196629836627.

726638926691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726638926691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726638926661) 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, 12469451 + ... + 12527588.

It is an arithmetic number, because the mean of its divisors is an integer number (93176466600).

Almost surely, 2^726638926691 is an apocalyptic number.

726638926691 is a deficient number, since it is larger than the sum of its proper divisors (18772806109).

726638926691 is a wasteful number, since it uses less digits than its factorization.

726638926691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24997789.

The product of its digits is 70543872, while the sum is 65.

The spelling of 726638926691 in words is "seven hundred twenty-six billion, six hundred thirty-eight million, nine hundred twenty-six thousand, six hundred ninety-one".