7357639721 has 2 divisors, whose sum is σ = 7357639722. Its totient is φ = 7357639720.

The previous prime is 7357639703. The next prime is 7357639733. The reversal of 7357639721 is 1279367537.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4361281600 + 2996358121 = 66040^2 + 54739^2 .

It is a cyclic number.

It is not a de Polignac number, because 7357639721 - 2¹⁰ = 7357638697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7357639721.

It is not a weakly prime, because it can be changed into another prime (7357639771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3678819860 + 3678819861.

It is an arithmetic number, because the mean of its divisors is an integer number (3678819861).

Almost surely, 2^7357639721 is an apocalyptic number.

It is an amenable number.

7357639721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7357639721 is an equidigital number, since it uses as much as digits as its factorization.

7357639721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1666980, while the sum is 50.

The square root of 7357639721 is about 85776.6851830962. The cubic root of 7357639721 is about 1944.9696971464.

The spelling of 7357639721 in words is "seven billion, three hundred fifty-seven million, six hundred thirty-nine thousand, seven hundred twenty-one".