726522505655321 has 4 divisors (see below), whose sum is σ = 738836446429200. Its totient is φ = 714208564881444.

The previous prime is 726522505655311. The next prime is 726522505655357. The reversal of 726522505655321 is 123556505225627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726522505655321 is a prime.

It is a super-2 number, since 2×726522505655321² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726522505655311) 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, 6156970386851 + ... + 6156970386968.

It is an arithmetic number, because the mean of its divisors is an integer number (184709111607300).

Almost surely, 2^{726522505655321} is an apocalyptic number.

It is an amenable number.

726522505655321 is a deficient number, since it is larger than the sum of its proper divisors (12313940773879).

726522505655321 is a wasteful number, since it uses less digits than its factorization.

726522505655321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12313940773878.

The product of its (nonzero) digits is 37800000, while the sum is 56.

The spelling of 726522505655321 in words is "seven hundred twenty-six trillion, five hundred twenty-two billion, five hundred five million, six hundred fifty-five thousand, three hundred twenty-one".