166603133234421 has 24 divisors (see below), whose sum is σ = 261676550169216. Its totient is φ = 101529616661280.

The previous prime is 166603133234411. The next prime is 166603133234423. The reversal of 166603133234421 is 124432331306661.

It is not a de Polignac number, because 166603133234421 - 2⁵ = 166603133234389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166603133234423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6912407385 + ... + 6912431486.

It is an arithmetic number, because the mean of its divisors is an integer number (10903189590384).

Almost surely, 2^{166603133234421} is an apocalyptic number.

It is an amenable number.

166603133234421 is a deficient number, since it is larger than the sum of its proper divisors (95073416934795).

166603133234421 is a wasteful number, since it uses less digits than its factorization.

166603133234421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13824838993 (or 13824838990 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 45.

The spelling of 166603133234421 in words is "one hundred sixty-six trillion, six hundred three billion, one hundred thirty-three million, two hundred thirty-four thousand, four hundred twenty-one".