2661256066 has 16 divisors (see below), whose sum is σ = 4569071040. Its totient is φ = 1138808880.

The previous prime is 2661256063. The next prime is 2661256069. The reversal of 2661256066 is 6606521662.

It is an interprime number because it is at equal distance from previous prime (2661256063) and next prime (2661256069).

It is not an unprimeable number, because it can be changed into a prime (2661256061) 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, 134536 + ... + 153043.

It is an arithmetic number, because the mean of its divisors is an integer number (285566940).

Almost surely, 2^2661256066 is an apocalyptic number.

2661256066 is a deficient number, since it is larger than the sum of its proper divisors (1907814974).

2661256066 is a wasteful number, since it uses less digits than its factorization.

2661256066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288249.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 2661256066 is about 51587.3634333060. The cubic root of 2661256066 is about 1385.7840384334.

The spelling of 2661256066 in words is "two billion, six hundred sixty-one million, two hundred fifty-six thousand, sixty-six".