8521256456 has 16 divisors (see below), whose sum is σ = 15978431040. Its totient is φ = 4260341520.

The previous prime is 8521256371. The next prime is 8521256467. The reversal of 8521256456 is 6546521258.

It is a happy number.

It is a super-2 number, since 2×8521256456² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142925 + ... + 193571.

It is an arithmetic number, because the mean of its divisors is an integer number (998651940).

Almost surely, 2^8521256456 is an apocalyptic number.

It is an amenable number.

8521256456 is a deficient number, since it is larger than the sum of its proper divisors (7457174584).

8521256456 is a wasteful number, since it uses less digits than its factorization.

8521256456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71684 (or 71680 counting only the distinct ones).

The product of its digits is 576000, while the sum is 44.

The square root of 8521256456 is about 92310.6519097336. The cubic root of 8521256456 is about 2042.5273411383.

The spelling of 8521256456 in words is "eight billion, five hundred twenty-one million, two hundred fifty-six thousand, four hundred fifty-six".