726620521799 has 4 divisors (see below), whose sum is σ = 726641996880. Its totient is φ = 726599046720.

The previous prime is 726620521793. The next prime is 726620521817. The reversal of 726620521799 is 997125026627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 997125026627 = 17 ⋅58654413331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726620521799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726620521793) 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, 10686707 + ... + 10754484.

It is an arithmetic number, because the mean of its divisors is an integer number (181660499220).

Almost surely, 2^726620521799 is an apocalyptic number.

726620521799 is a deficient number, since it is larger than the sum of its proper divisors (21475081).

726620521799 is a wasteful number, since it uses less digits than its factorization.

726620521799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21475080.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 726620521799 in words is "seven hundred twenty-six billion, six hundred twenty million, five hundred twenty-one thousand, seven hundred ninety-nine".