7356757721 has 2 divisors, whose sum is σ = 7356757722. Its totient is φ = 7356757720.

The previous prime is 7356757717. The next prime is 7356757741. The reversal of 7356757721 is 1277576537.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5014197721 + 2342560000 = 70811^2 + 48400^2 .

It is a cyclic number.

It is not a de Polignac number, because 7356757721 - 2² = 7356757717 is a prime.

It is a super-2 number, since 2×7356757721² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7356757721.

It is not a weakly prime, because it can be changed into another prime (7356757741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3678378860 + 3678378861.

It is an arithmetic number, because the mean of its divisors is an integer number (3678378861).

Almost surely, 2^7356757721 is an apocalyptic number.

It is an amenable number.

7356757721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7356757721 is an equidigital number, since it uses as much as digits as its factorization.

7356757721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160900, while the sum is 50.

The square root of 7356757721 is about 85771.5437718128. The cubic root of 7356757721 is about 1944.8919760343.

The spelling of 7356757721 in words is "seven billion, three hundred fifty-six million, seven hundred fifty-seven thousand, seven hundred twenty-one".