2165981671299 has 32 divisors (see below), whose sum is σ = 3075445013760. Its totient is φ = 1351249280000.

The previous prime is 2165981671277. The next prime is 2165981671331. The reversal of 2165981671299 is 9921761895612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2165981671299 - 2¹⁵ = 2165981638531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165981671229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7135084 + ... + 7432454.

It is an arithmetic number, because the mean of its divisors is an integer number (96107656680).

Almost surely, 2^{2165981671299} is an apocalyptic number.

2165981671299 is a deficient number, since it is larger than the sum of its proper divisors (909463342461).

2165981671299 is a wasteful number, since it uses less digits than its factorization.

2165981671299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298211.

The product of its digits is 29393280, while the sum is 66.

The spelling of 2165981671299 in words is "two trillion, one hundred sixty-five billion, nine hundred eighty-one million, six hundred seventy-one thousand, two hundred ninety-nine".