2166851651 has 2 divisors, whose sum is σ = 2166851652. Its totient is φ = 2166851650.

The previous prime is 2166851633. The next prime is 2166851707. The reversal of 2166851651 is 1561586612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2166851651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166851599 and 2166851608.

It is not a weakly prime, because it can be changed into another prime (2166851851) 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 as a sum of consecutive naturals, namely, 1083425825 + 1083425826.

It is an arithmetic number, because the mean of its divisors is an integer number (1083425826).

Almost surely, 2^2166851651 is an apocalyptic number.

2166851651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166851651 is an equidigital number, since it uses as much as digits as its factorization.

2166851651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 41.

The square root of 2166851651 is about 46549.4538206411. The cubic root of 2166851651 is about 1294.0261708701.

The spelling of 2166851651 in words is "two billion, one hundred sixty-six million, eight hundred fifty-one thousand, six hundred fifty-one".