4256388081 has 45 divisors (see below), whose sum is σ = 6999505513. Its totient is φ = 2575714680.

The previous prime is 4256388061. The next prime is 4256388137. The reversal of 4256388081 is 1808836524.

The square root of 4256388081 is 65241.

It is a perfect power (a square), and thus also a powerful number.

4256388081 is a `hidden beast` number, since 4 + 2 + 5 + 638 + 8 + 0 + 8 + 1 = 666.

It is not a de Polignac number, because 4256388081 - 2⁷ = 4256387953 is a prime.

It is a super-2 number, since 2×4256388081² = 36233678992157725122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4256388061) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6458530 + ... + 6459188.

Almost surely, 2^4256388081 is an apocalyptic number.

4256388081 is the 65241-st square number.

4256388081 is the 32621-st centered octagonal number.

It is an amenable number.

4256388081 is a deficient number, since it is larger than the sum of its proper divisors (2743117432).

4256388081 is an frugal number, since it uses more digits than its factorization.

4256388081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The cubic root of 4256388081 is about 1620.6170591706.

The spelling of 4256388081 in words is "four billion, two hundred fifty-six million, three hundred eighty-eight thousand, eighty-one".