166437688433 has 4 divisors (see below), whose sum is σ = 166451346420. Its totient is φ = 166424030448.

The previous prime is 166437688423. The next prime is 166437688447. The reversal of 166437688433 is 334886734661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 146391942544 + 20045745889 = 382612^2 + 141583^2 .

It is a cyclic number.

It is not a de Polignac number, because 166437688433 - 2¹⁸ = 166437426289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166437688423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6810698 + ... + 6835091.

It is an arithmetic number, because the mean of its divisors is an integer number (41612836605).

Almost surely, 2^166437688433 is an apocalyptic number.

It is an amenable number.

166437688433 is a deficient number, since it is larger than the sum of its proper divisors (13657987).

166437688433 is a wasteful number, since it uses less digits than its factorization.

166437688433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13657986.

The product of its digits is 41803776, while the sum is 59.

The spelling of 166437688433 in words is "one hundred sixty-six billion, four hundred thirty-seven million, six hundred eighty-eight thousand, four hundred thirty-three".