166537121 has 8 divisors (see below), whose sum is σ = 174230784. Its totient is φ = 159016480.

The previous prime is 166537087. The next prime is 166537139. The reversal of 166537121 is 121735661.

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

It is a cyclic number.

It is not a de Polignac number, because 166537121 - 2¹⁴ = 166520737 is a prime.

It is a super-2 number, since 2×166537121² = 55469225341937282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166537171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41285 + ... + 45138.

It is an arithmetic number, because the mean of its divisors is an integer number (21778848).

Almost surely, 2^166537121 is an apocalyptic number.

It is an amenable number.

166537121 is a deficient number, since it is larger than the sum of its proper divisors (7693663).

166537121 is an equidigital number, since it uses as much as digits as its factorization.

166537121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86511.

The product of its digits is 7560, while the sum is 32.

The square root of 166537121 is about 12904.9262299325. The cubic root of 166537121 is about 550.1785877354.

The spelling of 166537121 in words is "one hundred sixty-six million, five hundred thirty-seven thousand, one hundred twenty-one".