266890993 has 8 divisors (see below), whose sum is σ = 273977600. Its totient is φ = 259897248.

The previous prime is 266890991. The next prime is 266890999. The reversal of 266890993 is 399098662.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 266890993 - 2¹ = 266890991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266890993.

It is not an unprimeable number, because it can be changed into a prime (266890991) 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, 17373 + ... + 28906.

It is an arithmetic number, because the mean of its divisors is an integer number (34247200).

Almost surely, 2^266890993 is an apocalyptic number.

It is an amenable number.

266890993 is a deficient number, since it is larger than the sum of its proper divisors (7086607).

266890993 is an equidigital number, since it uses as much as digits as its factorization.

266890993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46431.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 266890993 is about 16336.7987378189. The cubic root of 266890993 is about 643.8400263953.

The spelling of 266890993 in words is "two hundred sixty-six million, eight hundred ninety thousand, nine hundred ninety-three".