6357645421 has 2 divisors, whose sum is σ = 6357645422. Its totient is φ = 6357645420.

The previous prime is 6357645367. The next prime is 6357645451. The reversal of 6357645421 is 1245467536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4155220521 + 2202424900 = 64461^2 + 46930^2 .

It is a cyclic number.

It is not a de Polignac number, because 6357645421 - 2¹¹ = 6357643373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6357645451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3178822710 + 3178822711.

It is an arithmetic number, because the mean of its divisors is an integer number (3178822711).

Almost surely, 2^6357645421 is an apocalyptic number.

It is an amenable number.

6357645421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6357645421 is an equidigital number, since it uses as much as digits as its factorization.

6357645421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 43.

The square root of 6357645421 is about 79734.8444596213. The cubic root of 6357645421 is about 1852.5307872106.

The spelling of 6357645421 in words is "six billion, three hundred fifty-seven million, six hundred forty-five thousand, four hundred twenty-one".