6656400106 has 4 divisors (see below), whose sum is σ = 9984600162. Its totient is φ = 3328200052.

The previous prime is 6656400089. The next prime is 6656400109. The reversal of 6656400106 is 6010046566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6010046566 = 2 ⋅3005023283.

It can be written as a sum of positive squares in only one way, i.e., 4117147225 + 2539252881 = 64165^2 + 50391^2 .

It is a super-2 number, since 2×6656400106² = 88615324742313622472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6656400109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1664100025 + ... + 1664100028.

Almost surely, 2^6656400106 is an apocalyptic number.

6656400106 is a deficient number, since it is larger than the sum of its proper divisors (3328200056).

6656400106 is a wasteful number, since it uses less digits than its factorization.

6656400106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328200055.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 6656400106 is about 81586.7642819594. The cubic root of 6656400106 is about 1881.1054410527.

The spelling of 6656400106 in words is "six billion, six hundred fifty-six million, four hundred thousand, one hundred six".