166121426 has 8 divisors (see below), whose sum is σ = 249519744. Its totient is φ = 82948180.

The previous prime is 166121411. The next prime is 166121443. The reversal of 166121426 is 624121661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 54410 + ... + 57381.

It is an arithmetic number, because the mean of its divisors is an integer number (31189968).

Almost surely, 2^166121426 is an apocalyptic number.

166121426 is a deficient number, since it is larger than the sum of its proper divisors (83398318).

166121426 is a wasteful number, since it uses less digits than its factorization.

166121426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112536.

The product of its digits is 3456, while the sum is 29.

The square root of 166121426 is about 12888.8101079968. The cubic root of 166121426 is about 549.7204375381.

The spelling of 166121426 in words is "one hundred sixty-six million, one hundred twenty-one thousand, four hundred twenty-six".