2166254140263 has 16 divisors (see below), whose sum is σ = 2911371805056. Its totient is φ = 1432685348640.

The previous prime is 2166254140229. The next prime is 2166254140273. The reversal of 2166254140263 is 3620414526612.

It is a happy number.

It is not a de Polignac number, because 2166254140263 - 2⁶ = 2166254140199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166254140213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3781848 + ... + 4316813.

It is an arithmetic number, because the mean of its divisors is an integer number (181960737816).

Almost surely, 2^{2166254140263} is an apocalyptic number.

2166254140263 is a deficient number, since it is larger than the sum of its proper divisors (745117664793).

2166254140263 is a wasteful number, since it uses less digits than its factorization.

2166254140263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8099374.

The product of its (nonzero) digits is 414720, while the sum is 42.

Adding to 2166254140263 its reverse (3620414526612), we get a palindrome (5786668666875).

The spelling of 2166254140263 in words is "two trillion, one hundred sixty-six billion, two hundred fifty-four million, one hundred forty thousand, two hundred sixty-three".