2166551412051 has 16 divisors (see below), whose sum is σ = 3112783246496. Its totient is φ = 1332474852096.

The previous prime is 2166551412029. The next prime is 2166551412071. The reversal of 2166551412051 is 1502141556612.

It is not a de Polignac number, because 2166551412051 - 2⁶ = 2166551411987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166551412071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16340530 + ... + 16472583.

It is an arithmetic number, because the mean of its divisors is an integer number (194548952906).

Almost surely, 2^{2166551412051} is an apocalyptic number.

2166551412051 is a deficient number, since it is larger than the sum of its proper divisors (946231834445).

2166551412051 is a wasteful number, since it uses less digits than its factorization.

2166551412051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32814822.

The product of its (nonzero) digits is 72000, while the sum is 39.

Adding to 2166551412051 its reverse (1502141556612), we get a palindrome (3668692968663).

The spelling of 2166551412051 in words is "two trillion, one hundred sixty-six billion, five hundred fifty-one million, four hundred twelve thousand, fifty-one".