266639698989 has 16 divisors (see below), whose sum is σ = 395103234240. Its totient is φ = 177723143280.

The previous prime is 266639698883. The next prime is 266639699093. The reversal of 266639698989 is 989896936662.

It is not a de Polignac number, because 266639698989 - 2¹¹ = 266639696941 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266639693989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 884547 + ... + 1147040.

It is an arithmetic number, because the mean of its divisors is an integer number (24693952140).

Almost surely, 2^266639698989 is an apocalyptic number.

It is an amenable number.

266639698989 is a deficient number, since it is larger than the sum of its proper divisors (128463535251).

266639698989 is a wasteful number, since it uses less digits than its factorization.

266639698989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036457 (or 2036451 counting only the distinct ones).

The product of its digits is 3265173504, while the sum is 81.

The spelling of 266639698989 in words is "two hundred sixty-six billion, six hundred thirty-nine million, six hundred ninety-eight thousand, nine hundred eighty-nine".