266640051 has 8 divisors (see below), whose sum is σ = 358782160. Its totient is φ = 176128992.

The previous prime is 266640047. The next prime is 266640107. The reversal of 266640051 is 150046662.

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

It is not a de Polignac number, because 266640051 - 2² = 266640047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266640001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407380 + ... + 408033.

It is an arithmetic number, because the mean of its divisors is an integer number (44847770).

Almost surely, 2^266640051 is an apocalyptic number.

266640051 is a deficient number, since it is larger than the sum of its proper divisors (92142109).

266640051 is a wasteful number, since it uses less digits than its factorization.

266640051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815525.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 266640051 is about 16329.1166631879. The cubic root of 266640051 is about 643.6381747382.

The spelling of 266640051 in words is "two hundred sixty-six million, six hundred forty thousand, fifty-one".