17661666214337 has 4 divisors (see below), whose sum is σ = 17661674926020. Its totient is φ = 17661657502656.

The previous prime is 17661666214279. The next prime is 17661666214349. The reversal of 17661666214337 is 73341266616671.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2662784294416 + 14998881919921 = 1631804^2 + 3872839^2 .

It is a cyclic number.

It is not a de Polignac number, because 17661666214337 - 2²⁰ = 17661665165761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17661666214937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459989 + ... + 5961117.

It is an arithmetic number, because the mean of its divisors is an integer number (4415418731505).

Almost surely, 2^{17661666214337} is an apocalyptic number.

It is an amenable number.

17661666214337 is a deficient number, since it is larger than the sum of its proper divisors (8711683).

17661666214337 is an equidigital number, since it uses as much as digits as its factorization.

17661666214337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8711682.

The product of its digits is 27433728, while the sum is 59.

The spelling of 17661666214337 in words is "seventeen trillion, six hundred sixty-one billion, six hundred sixty-six million, two hundred fourteen thousand, three hundred thirty-seven".