6556640481 has 6 divisors (see below), whose sum is σ = 9470702930. Its totient is φ = 4371093648.

The previous prime is 6556640477. The next prime is 6556640507. The reversal of 6556640481 is 1840466556.

6556640481 is a `hidden beast` number, since 6 + 5 + 566 + 4 + 0 + 4 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3967866081 + 2588774400 = 62991^2 + 50880^2 .

It is not a de Polignac number, because 6556640481 - 2² = 6556640477 is a prime.

It is a super-2 number, since 2×6556640481² = 85979068794175822722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556640401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364257796 + ... + 364257813.

Almost surely, 2^6556640481 is an apocalyptic number.

It is an amenable number.

6556640481 is a deficient number, since it is larger than the sum of its proper divisors (2914062449).

6556640481 is a wasteful number, since it uses less digits than its factorization.

6556640481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728515615 (or 728515612 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 6556640481 is about 80973.0849171501. The cubic root of 6556640481 is about 1871.6607094177.

The spelling of 6556640481 in words is "six billion, five hundred fifty-six million, six hundred forty thousand, four hundred eighty-one".