8256669421 has 64 divisors (see below), whose sum is σ = 11851370496. Its totient is φ = 5541465600.

The previous prime is 8256669409. The next prime is 8256669433. The reversal of 8256669421 is 1249666528.

It is an interprime number because it is at equal distance from previous prime (8256669409) and next prime (8256669433).

It is not a de Polignac number, because 8256669421 - 2⁵ = 8256669389 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8256669481) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 939570 + ... + 948316.

It is an arithmetic number, because the mean of its divisors is an integer number (185177664).

Almost surely, 2^8256669421 is an apocalyptic number.

It is an amenable number.

8256669421 is a deficient number, since it is larger than the sum of its proper divisors (3594701075).

8256669421 is a wasteful number, since it uses less digits than its factorization.

8256669421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8842.

The product of its digits is 1244160, while the sum is 49.

The square root of 8256669421 is about 90866.2171601746. The cubic root of 8256669421 is about 2021.1643632672.

The spelling of 8256669421 in words is "eight billion, two hundred fifty-six million, six hundred sixty-nine thousand, four hundred twenty-one".