2666650261 has 4 divisors (see below), whose sum is σ = 2909073024. Its totient is φ = 2424227500.

The previous prime is 2666650249. The next prime is 2666650267. The reversal of 2666650261 is 1620566662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2666650261 - 2²¹ = 2664553109 is a prime.

It is a super-2 number, since 2×2666650261² = 14222047228982736242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666650267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121211365 + ... + 121211386.

It is an arithmetic number, because the mean of its divisors is an integer number (727268256).

Almost surely, 2^2666650261 is an apocalyptic number.

It is an amenable number.

2666650261 is a deficient number, since it is larger than the sum of its proper divisors (242422763).

2666650261 is a wasteful number, since it uses less digits than its factorization.

2666650261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242422762.

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

The square root of 2666650261 is about 51639.6191020035. The cubic root of 2666650261 is about 1386.7197049320.

The spelling of 2666650261 in words is "two billion, six hundred sixty-six million, six hundred fifty thousand, two hundred sixty-one".