2147261666 has 8 divisors (see below), whose sum is σ = 3513700944. Its totient is φ = 976028020.

The previous prime is 2147261657. The next prime is 2147261681. The reversal of 2147261666 is 6661627412.

It is a happy number.

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

It is a super-2 number, since 2×2147261666² = 9221465324546191112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48801380 + ... + 48801423.

It is an arithmetic number, because the mean of its divisors is an integer number (439212618).

Almost surely, 2^2147261666 is an apocalyptic number.

2147261666 is a deficient number, since it is larger than the sum of its proper divisors (1366439278).

2147261666 is a wasteful number, since it uses less digits than its factorization.

2147261666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97602816.

The product of its digits is 145152, while the sum is 41.

The square root of 2147261666 is about 46338.5548544622. The cubic root of 2147261666 is about 1290.1146996544.

It can be divided in two parts, 21472 and 61666, that added together give a palindrome (83138).

The spelling of 2147261666 in words is "two billion, one hundred forty-seven million, two hundred sixty-one thousand, six hundred sixty-six".