425566819 has 2 divisors, whose sum is σ = 425566820. Its totient is φ = 425566818.

The previous prime is 425566789. The next prime is 425566837. The reversal of 425566819 is 918665524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 425566819 - 2⁵ = 425566787 is a prime.

It is a super-2 number, since 2×425566819² = 362214234867557522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (425566849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212783409 + 212783410.

It is an arithmetic number, because the mean of its divisors is an integer number (212783410).

Almost surely, 2^425566819 is an apocalyptic number.

425566819 is a deficient number, since it is larger than the sum of its proper divisors (1).

425566819 is an equidigital number, since it uses as much as digits as its factorization.

425566819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 46.

The square root of 425566819 is about 20629.2709274952. The cubic root of 425566819 is about 752.1813938028.

The spelling of 425566819 in words is "four hundred twenty-five million, five hundred sixty-six thousand, eight hundred nineteen".