166457537 has 4 divisors (see below), whose sum is σ = 175218480. Its totient is φ = 157696596.

The previous prime is 166457531. The next prime is 166457539. The reversal of 166457537 is 735754661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 735754661 = 139 ⋅5293199.

It is a cyclic number.

It is not a de Polignac number, because 166457537 - 2⁴ = 166457521 is a prime.

It is a super-2 number, since 2×166457537² = 55416223248212738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166457531) 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, 4380443 + ... + 4380480.

It is an arithmetic number, because the mean of its divisors is an integer number (43804620).

Almost surely, 2^166457537 is an apocalyptic number.

It is an amenable number.

166457537 is a deficient number, since it is larger than the sum of its proper divisors (8760943).

166457537 is an equidigital number, since it uses as much as digits as its factorization.

166457537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8760942.

The product of its digits is 529200, while the sum is 44.

The square root of 166457537 is about 12901.8423878142. The cubic root of 166457537 is about 550.0909348266.

The spelling of 166457537 in words is "one hundred sixty-six million, four hundred fifty-seven thousand, five hundred thirty-seven".