6566665403 has 2 divisors, whose sum is σ = 6566665404. Its totient is φ = 6566665402.

The previous prime is 6566665351. The next prime is 6566665409. The reversal of 6566665403 is 3045666656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6566665403 - 2²⁴ = 6549888187 is a prime.

It is not a weakly prime, because it can be changed into another prime (6566665409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3283332701 + 3283332702.

It is an arithmetic number, because the mean of its divisors is an integer number (3283332702).

Almost surely, 2^6566665403 is an apocalyptic number.

6566665403 is a deficient number, since it is larger than the sum of its proper divisors (1).

6566665403 is an equidigital number, since it uses as much as digits as its factorization.

6566665403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 47.

The square root of 6566665403 is about 81034.9640772426. The cubic root of 6566665403 is about 1872.6141294890.

The spelling of 6566665403 in words is "six billion, five hundred sixty-six million, six hundred sixty-five thousand, four hundred three".