2566666949 has 32 divisors (see below), whose sum is σ = 3307247616. Its totient is φ = 1933657920.

The previous prime is 2566666909. The next prime is 2566666961. The reversal of 2566666949 is 9496666652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2566666949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566666909) 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 31 ways as a sum of consecutive naturals, for example, 461624 + ... + 467150.

It is an arithmetic number, because the mean of its divisors is an integer number (103351488).

Almost surely, 2^2566666949 is an apocalyptic number.

It is an amenable number.

2566666949 is a deficient number, since it is larger than the sum of its proper divisors (740580667).

2566666949 is a wasteful number, since it uses less digits than its factorization.

2566666949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745.

The product of its digits is 25194240, while the sum is 59.

The square root of 2566666949 is about 50662.2832983276. The cubic root of 2566666949 is about 1369.1672615277.

The spelling of 2566666949 in words is "two billion, five hundred sixty-six million, six hundred sixty-six thousand, nine hundred forty-nine".