6215666 has 4 divisors (see below), whose sum is σ = 9323502. Its totient is φ = 3107832.

The previous prime is 6215653. The next prime is 6215669. The reversal of 6215666 is 6665126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6145441 + 70225 = 2479^2 + 265^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6215669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1553915 + ... + 1553918.

Almost surely, 2^6215666 is an apocalyptic number.

6215666 is a deficient number, since it is larger than the sum of its proper divisors (3107836).

6215666 is a wasteful number, since it uses less digits than its factorization.

6215666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107835.

The product of its digits is 12960, while the sum is 32.

The square root of 6215666 is about 2493.1237434191. The cubic root of 6215666 is about 183.8636552942.

The spelling of 6215666 in words is "six million, two hundred fifteen thousand, six hundred sixty-six".