2166642431 has 2 divisors, whose sum is σ = 2166642432. Its totient is φ = 2166642430.

The previous prime is 2166642397. The next prime is 2166642437. The reversal of 2166642431 is 1342466612.

2166642431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2166642431 - 2²⁶ = 2099533567 is a prime.

It is a super-2 number, since 2×2166642431² = 9388678847619179522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2166642391 and 2166642400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166642437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083321215 + 1083321216.

It is an arithmetic number, because the mean of its divisors is an integer number (1083321216).

Almost surely, 2^2166642431 is an apocalyptic number.

2166642431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166642431 is an equidigital number, since it uses as much as digits as its factorization.

2166642431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 35.

The square root of 2166642431 is about 46547.2064790144. The cubic root of 2166642431 is about 1293.9845213692.

The spelling of 2166642431 in words is "two billion, one hundred sixty-six million, six hundred forty-two thousand, four hundred thirty-one".