7206660721 has 8 divisors (see below), whose sum is σ = 7776273960. Its totient is φ = 6639226752.

The previous prime is 7206660707. The next prime is 7206660749. The reversal of 7206660721 is 1270666027.

It can be written as a sum of positive squares in 4 ways, for example, as 518400 + 7206142321 = 720^2 + 84889^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7206660721 - 2¹¹ = 7206658673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7206660701) 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, 537940 + ... + 551173.

It is an arithmetic number, because the mean of its divisors is an integer number (972034245).

Almost surely, 2^7206660721 is an apocalyptic number.

It is an amenable number.

7206660721 is a deficient number, since it is larger than the sum of its proper divisors (569613239).

7206660721 is a wasteful number, since it uses less digits than its factorization.

7206660721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089635.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 7206660721 is about 84892.0533442324. The cubic root of 7206660721 is about 1931.5740352646.

The spelling of 7206660721 in words is "seven billion, two hundred six million, six hundred sixty thousand, seven hundred twenty-one".