2166451551 has 12 divisors (see below), whose sum is σ = 3413802600. Its totient is φ = 1313000880.

The previous prime is 2166451517. The next prime is 2166451561. The reversal of 2166451551 is 1551546612.

2166451551 is a `hidden beast` number, since 2 + 1 + 6 + 645 + 1 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 2166451551 - 2¹³ = 2166443359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166451501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10941576 + ... + 10941773.

It is an arithmetic number, because the mean of its divisors is an integer number (284483550).

Almost surely, 2^2166451551 is an apocalyptic number.

2166451551 is a deficient number, since it is larger than the sum of its proper divisors (1247351049).

2166451551 is a wasteful number, since it uses less digits than its factorization.

2166451551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21883366 (or 21883363 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 2166451551 is about 46545.1560422779. The cubic root of 2166451551 is about 1293.9465204796.

The spelling of 2166451551 in words is "two billion, one hundred sixty-six million, four hundred fifty-one thousand, five hundred fifty-one".