721266327076 has 27 divisors (see below), whose sum is σ = 1293877630227. Its totient is φ = 351803261760.

The previous prime is 721266327071. The next prime is 721266327113. The reversal of 721266327076 is 670723662127.

The square root of 721266327076 is 849274.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 206924912100 + 514341414976 = 454890^2 + 717176^2 .

It is a super-2 number, since 2×721266327076² (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 (721266327071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 69635290 + ... + 69645646.

Almost surely, 2^721266327076 is an apocalyptic number.

721266327076 is the 849274-th square number.

It is an amenable number.

721266327076 is a deficient number, since it is larger than the sum of its proper divisors (572611303151).

721266327076 is an frugal number, since it uses more digits than its factorization.

721266327076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20800 (or 10400 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 49.

Multiplying 721266327076 by its sum of digits (49), we get a square (35342050026724 = 5944918²).

The spelling of 721266327076 in words is "seven hundred twenty-one billion, two hundred sixty-six million, three hundred twenty-seven thousand, seventy-six".