6361256556 has 72 divisors (see below), whose sum is σ = 16814214144. Its totient is φ = 2023966560.

The previous prime is 6361256549. The next prime is 6361256567. The reversal of 6361256556 is 6556521636.

6361256556 is a `hidden beast` number, since 6 + 36 + 1 + 2 + 565 + 56 = 666.

It is a super-2 number, since 2×6361256556² = 80931169942505962272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 398725 + ... + 414371.

It is an arithmetic number, because the mean of its divisors is an integer number (233530752).

Almost surely, 2^6361256556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6361256556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8407107072).

6361256556 is an abundant number, since it is smaller than the sum of its proper divisors (10452957588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6361256556 is a wasteful number, since it uses less digits than its factorization.

6361256556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16171 (or 16166 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 6361256556 is about 79757.4858931749. The cubic root of 6361256556 is about 1852.8814659149.

The spelling of 6361256556 in words is "six billion, three hundred sixty-one million, two hundred fifty-six thousand, five hundred fifty-six".