7420764521 has 2 divisors, whose sum is σ = 7420764522. Its totient is φ = 7420764520.

The previous prime is 7420764487. The next prime is 7420764523. The reversal of 7420764521 is 1254670247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5981320921 + 1439443600 = 77339^2 + 37940^2 .

It is a cyclic number.

It is not a de Polignac number, because 7420764521 - 2⁶ = 7420764457 is a prime.

It is a super-2 number, since 2×7420764521² (a number of 21 digits) contains 22 as substring.

Together with 7420764523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7420764523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710382260 + 3710382261.

It is an arithmetic number, because the mean of its divisors is an integer number (3710382261).

Almost surely, 2^7420764521 is an apocalyptic number.

It is an amenable number.

7420764521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7420764521 is an equidigital number, since it uses as much as digits as its factorization.

7420764521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 7420764521 is about 86143.8594503404. The cubic root of 7420764521 is about 1950.5161483558.

The spelling of 7420764521 in words is "seven billion, four hundred twenty million, seven hundred sixty-four thousand, five hundred twenty-one".