214518689681 has 2 divisors, whose sum is σ = 214518689682. Its totient is φ = 214518689680.

The previous prime is 214518689647. The next prime is 214518689689. The reversal of 214518689681 is 186986815412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145935460225 + 68583229456 = 382015^2 + 261884^2 .

It is a cyclic number.

It is not a de Polignac number, because 214518689681 - 2⁶ = 214518689617 is a prime.

It is a super-2 number, since 2×214518689681² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 214518689681.

It is not a weakly prime, because it can be changed into another prime (214518689689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107259344840 + 107259344841.

It is an arithmetic number, because the mean of its divisors is an integer number (107259344841).

Almost surely, 2^214518689681 is an apocalyptic number.

It is an amenable number.

214518689681 is a deficient number, since it is larger than the sum of its proper divisors (1).

214518689681 is an equidigital number, since it uses as much as digits as its factorization.

214518689681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6635520, while the sum is 59.

The spelling of 214518689681 in words is "two hundred fourteen billion, five hundred eighteen million, six hundred eighty-nine thousand, six hundred eighty-one".