7420521457 has 2 divisors, whose sum is σ = 7420521458. Its totient is φ = 7420521456.

The previous prime is 7420521443. The next prime is 7420521461. The reversal of 7420521457 is 7541250247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5242339216 + 2178182241 = 72404^2 + 46671^2 .

It is a cyclic number.

It is not a de Polignac number, because 7420521457 - 2²⁷ = 7286303729 is a prime.

It is not a weakly prime, because it can be changed into another prime (7420521557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710260728 + 3710260729.

It is an arithmetic number, because the mean of its divisors is an integer number (3710260729).

Almost surely, 2^7420521457 is an apocalyptic number.

It is an amenable number.

7420521457 is a deficient number, since it is larger than the sum of its proper divisors (1).

7420521457 is an equidigital number, since it uses as much as digits as its factorization.

7420521457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78400, while the sum is 37.

The square root of 7420521457 is about 86142.4486359658. The cubic root of 7420521457 is about 1950.4948520131.

The spelling of 7420521457 in words is "seven billion, four hundred twenty million, five hundred twenty-one thousand, four hundred fifty-seven".