6555705981 has 16 divisors (see below), whose sum is σ = 9539883840. Its totient is φ = 3971358720.

The previous prime is 6555705979. The next prime is 6555706013. The reversal of 6555705981 is 1895075556.

It is a happy number.

It is not a de Polignac number, because 6555705981 - 2¹ = 6555705979 is a prime.

It is a super-2 number, since 2×6555705981² = 85954561818638344722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555705931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31101 + ... + 118653.

It is an arithmetic number, because the mean of its divisors is an integer number (596242740).

Almost surely, 2^6555705981 is an apocalyptic number.

It is an amenable number.

6555705981 is a deficient number, since it is larger than the sum of its proper divisors (2984177859).

6555705981 is a wasteful number, since it uses less digits than its factorization.

6555705981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89836.

The product of its (nonzero) digits is 1890000, while the sum is 51.

The square root of 6555705981 is about 80967.3142755767. The cubic root of 6555705981 is about 1871.5717843022.

The spelling of 6555705981 in words is "six billion, five hundred fifty-five million, seven hundred five thousand, nine hundred eighty-one".