2158662921269 has 2 divisors, whose sum is σ = 2158662921270. Its totient is φ = 2158662921268.

The previous prime is 2158662921251. The next prime is 2158662921271. The reversal of 2158662921269 is 9621292668512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2151663591025 + 6999330244 = 1466855^2 + 83662^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158662921269 - 2⁴⁰ = 1059151293493 is a prime.

It is a super-2 number, since 2×2158662921269² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 2158662921271, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158662921209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079331460634 + 1079331460635.

It is an arithmetic number, because the mean of its divisors is an integer number (1079331460635).

Almost surely, 2^{2158662921269} is an apocalyptic number.

It is an amenable number.

2158662921269 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158662921269 is an equidigital number, since it uses as much as digits as its factorization.

2158662921269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11197440, while the sum is 59.

The spelling of 2158662921269 in words is "two trillion, one hundred fifty-eight billion, six hundred sixty-two million, nine hundred twenty-one thousand, two hundred sixty-nine".