166765537 has 4 divisors (see below), whose sum is σ = 167152896. Its totient is φ = 166378180.

The previous prime is 166765519. The next prime is 166765559. The reversal of 166765537 is 735567661.

166765537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 735567661 = 23321 ⋅31541.

It is a cyclic number.

It is not a de Polignac number, because 166765537 - 2²³ = 158376929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166765517) 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, 193033 + ... + 193894.

It is an arithmetic number, because the mean of its divisors is an integer number (41788224).

Almost surely, 2^166765537 is an apocalyptic number.

It is an amenable number.

166765537 is a deficient number, since it is larger than the sum of its proper divisors (387359).

166765537 is an equidigital number, since it uses as much as digits as its factorization.

166765537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387358.

The product of its digits is 793800, while the sum is 46.

The square root of 166765537 is about 12913.7731511747. The cubic root of 166765537 is about 550.4300075205.

It can be divided in two parts, 166 and 765537, that added together give a triangular number (765703 = T₁₂₃₇).

The spelling of 166765537 in words is "one hundred sixty-six million, seven hundred sixty-five thousand, five hundred thirty-seven".