6446655 has 48 divisors (see below), whose sum is σ = 12368160. Its totient is φ = 3174912.

The previous prime is 6446653. The next prime is 6446659. The reversal of 6446655 is 5566446.

It is a happy number.

6446655 is a `hidden beast` number, since 644 + 6 + 6 + 5 + 5 = 666.

It is not a de Polignac number, because 6446655 - 2¹ = 6446653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121609 + ... + 121661.

It is an arithmetic number, because the mean of its divisors is an integer number (257670).

Almost surely, 2^6446655 is an apocalyptic number.

6446655 is a deficient number, since it is larger than the sum of its proper divisors (5921505).

6446655 is a wasteful number, since it uses less digits than its factorization.

6446655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 78 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 6446655 is about 2539.0263882047. The cubic root of 6446655 is about 186.1136142498.

The spelling of 6446655 in words is "six million, four hundred forty-six thousand, six hundred fifty-five".