626666 has 4 divisors (see below), whose sum is σ = 940002. Its totient is φ = 313332.

The previous prime is 626663. The next prime is 626683. The reversal of 626666 is 666626.

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., 483025 + 143641 = 695^2 + 379^2 .

626666 is a modest number, since divided by 666 gives 626 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (626663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156665 + ... + 156668.

2⁶²⁶⁶⁶⁶ is an apocalyptic number.

626666 is a deficient number, since it is larger than the sum of its proper divisors (313336).

626666 is a wasteful number, since it uses less digits than its factorization.

626666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313335.

The product of its digits is 15552, while the sum is 32.

The square root of 626666 is about 791.6223847265. The cubic root of 626666 is about 85.5746984644.

The spelling of 626666 in words is "six hundred twenty-six thousand, six hundred sixty-six".