4256569987 has 2 divisors, whose sum is σ = 4256569988. Its totient is φ = 4256569986.

The previous prime is 4256569963. The next prime is 4256569997. The reversal of 4256569987 is 7899656524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4256569987 - 2²⁷ = 4122352259 is a prime.

It is not a weakly prime, because it can be changed into another prime (4256569907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128284993 + 2128284994.

It is an arithmetic number, because the mean of its divisors is an integer number (2128284994).

Almost surely, 2^4256569987 is an apocalyptic number.

4256569987 is a deficient number, since it is larger than the sum of its proper divisors (1).

4256569987 is an equidigital number, since it uses as much as digits as its factorization.

4256569987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 61.

The square root of 4256569987 is about 65242.3940931048. The cubic root of 4256569987 is about 1620.6401457063.

The spelling of 4256569987 in words is "four billion, two hundred fifty-six million, five hundred sixty-nine thousand, nine hundred eighty-seven".