6551481864 has 32 divisors (see below), whose sum is σ = 16380861120. Its totient is φ = 2183539776.

The previous prime is 6551481821. The next prime is 6551481869. The reversal of 6551481864 is 4681841556.

It is a super-2 number, since 2×6551481864² = 85843829228641828992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6551481869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249154 + ... + 274190.

It is an arithmetic number, because the mean of its divisors is an integer number (511901910).

Almost surely, 2^6551481864 is an apocalyptic number.

It is an amenable number.

6551481864 is an abundant number, since it is smaller than the sum of its proper divisors (9829379256).

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

6551481864 is a wasteful number, since it uses less digits than its factorization.

6551481864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35949 (or 35945 counting only the distinct ones).

The product of its digits is 921600, while the sum is 48.

The square root of 6551481864 is about 80941.2247498146. The cubic root of 6551481864 is about 1871.1697204705.

The spelling of 6551481864 in words is "six billion, five hundred fifty-one million, four hundred eighty-one thousand, eight hundred sixty-four".