266639494 has 16 divisors (see below), whose sum is σ = 450395136. Its totient is φ = 117289800.

The previous prime is 266639453. The next prime is 266639497. The reversal of 266639494 is 494936662.

266639494 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266639497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194802 + ... + 196165.

It is an arithmetic number, because the mean of its divisors is an integer number (28149696).

Almost surely, 2^266639494 is an apocalyptic number.

266639494 is a deficient number, since it is larger than the sum of its proper divisors (183755642).

266639494 is a wasteful number, since it uses less digits than its factorization.

266639494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391011.

The product of its digits is 1679616, while the sum is 49.

The square root of 266639494 is about 16329.0996077555. The cubic root of 266639494 is about 643.6377265601.

The spelling of 266639494 in words is "two hundred sixty-six million, six hundred thirty-nine thousand, four hundred ninety-four".