7371165721 has 2 divisors, whose sum is σ = 7371165722. Its totient is φ = 7371165720.

The previous prime is 7371165631. The next prime is 7371165727. The reversal of 7371165721 is 1275611737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5685160000 + 1686005721 = 75400^2 + 41061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7371165721 is a prime.

It is not a weakly prime, because it can be changed into another prime (7371165727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3685582860 + 3685582861.

It is an arithmetic number, because the mean of its divisors is an integer number (3685582861).

Almost surely, 2^7371165721 is an apocalyptic number.

It is an amenable number.

7371165721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7371165721 is an equidigital number, since it uses as much as digits as its factorization.

7371165721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 40.

The square root of 7371165721 is about 85855.4932488306. The cubic root of 7371165721 is about 1946.1608198692.

The spelling of 7371165721 in words is "seven billion, three hundred seventy-one million, one hundred sixty-five thousand, seven hundred twenty-one".