7943425621 has 2 divisors, whose sum is σ = 7943425622. Its totient is φ = 7943425620.

The previous prime is 7943425619. The next prime is 7943425643. The reversal of 7943425621 is 1265243497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7131802500 + 811623121 = 84450^2 + 28489^2 .

It is a cyclic number.

It is not a de Polignac number, because 7943425621 - 2¹ = 7943425619 is a prime.

Together with 7943425619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7943425601) 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, 3971712810 + 3971712811.

It is an arithmetic number, because the mean of its divisors is an integer number (3971712811).

Almost surely, 2^7943425621 is an apocalyptic number.

It is an amenable number.

7943425621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7943425621 is an equidigital number, since it uses as much as digits as its factorization.

7943425621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 43.

The square root of 7943425621 is about 89125.8975887480. The cubic root of 7943425621 is about 1995.2743111436.

The spelling of 7943425621 in words is "seven billion, nine hundred forty-three million, four hundred twenty-five thousand, six hundred twenty-one".