166623401302243 has 4 divisors (see below), whose sum is σ = 166623436479888. Its totient is φ = 166623366124600.

The previous prime is 166623401302201. The next prime is 166623401302279. The reversal of 166623401302243 is 342203104326661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166623401302243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166623401302243.

It is not an unprimeable number, because it can be changed into a prime (166623401303243) 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, 9126871 + ... + 20409472.

It is an arithmetic number, because the mean of its divisors is an integer number (41655859119972).

Almost surely, 2^{166623401302243} is an apocalyptic number.

166623401302243 is a deficient number, since it is larger than the sum of its proper divisors (35177645).

166623401302243 is an equidigital number, since it uses as much as digits as its factorization.

166623401302243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35177644.

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 166623401302243 in words is "one hundred sixty-six trillion, six hundred twenty-three billion, four hundred one million, three hundred two thousand, two hundred forty-three".