2166451276 has 72 divisors (see below), whose sum is σ = 4294338048. Its totient is φ = 955125600.

The previous prime is 2166451237. The next prime is 2166451277. The reversal of 2166451276 is 6721546612.

It is a happy number.

It is a super-2 number, since 2×2166451276² = 9387022262564056352, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2166451277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2979625 + ... + 2980351.

It is an arithmetic number, because the mean of its divisors is an integer number (59643584).

Almost surely, 2^2166451276 is an apocalyptic number.

It is an amenable number.

2166451276 is a deficient number, since it is larger than the sum of its proper divisors (2127886772).

2166451276 is a wasteful number, since it uses less digits than its factorization.

2166451276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931 (or 918 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 2166451276 is about 46545.1530881573. The cubic root of 2166451276 is about 1293.9464657303.

Adding to 2166451276 its reverse (6721546612), we get a palindrome (8887997888).

The spelling of 2166451276 in words is "two billion, one hundred sixty-six million, four hundred fifty-one thousand, two hundred seventy-six".