6215725881 has 12 divisors (see below), whose sum is σ = 8980681008. Its totient is φ = 4142704824.

The previous prime is 6215725877. The next prime is 6215725909. The reversal of 6215725881 is 1885275126.

6215725881 is a `hidden beast` number, since 6 + 21 + 572 + 58 + 8 + 1 = 666.

It is not a de Polignac number, because 6215725881 - 2² = 6215725877 is a prime.

It is a super-2 number, since 2×6215725881² = 77270496455466452322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6215725801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56575 + ... + 125028.

It is an arithmetic number, because the mean of its divisors is an integer number (748390084).

Almost surely, 2^6215725881 is an apocalyptic number.

It is an amenable number.

6215725881 is a deficient number, since it is larger than the sum of its proper divisors (2764955127).

6215725881 is a wasteful number, since it uses less digits than its factorization.

6215725881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185412 (or 185409 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 6215725881 is about 78839.8749428232. The cubic root of 6215725881 is about 1838.6424573263.

The spelling of 6215725881 in words is "six billion, two hundred fifteen million, seven hundred twenty-five thousand, eight hundred eighty-one".