266138819 has 8 divisors (see below), whose sum is σ = 279110400. Its totient is φ = 253283976.

The previous prime is 266138797. The next prime is 266138837. The reversal of 266138819 is 918831662.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266138819 is a prime.

It is a super-2 number, since 2×266138819² = 141659741957429522, which contains 22 as substring.

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 266138819.

It is not an unprimeable number, because it can be changed into a prime (266138839) 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, 24497 + ... + 33650.

It is an arithmetic number, because the mean of its divisors is an integer number (34888800).

Almost surely, 2^266138819 is an apocalyptic number.

266138819 is a deficient number, since it is larger than the sum of its proper divisors (12971581).

266138819 is a wasteful number, since it uses less digits than its factorization.

266138819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58369.

The product of its digits is 124416, while the sum is 44.

The square root of 266138819 is about 16313.7616446974. The cubic root of 266138819 is about 643.2346164465.

The spelling of 266138819 in words is "two hundred sixty-six million, one hundred thirty-eight thousand, eight hundred nineteen".