166653537 has 4 divisors (see below), whose sum is σ = 222204720. Its totient is φ = 111102356.

The previous prime is 166653527. The next prime is 166653559. The reversal of 166653537 is 735356661.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 166653537 - 2²³ = 158264929 is a prime.

It is a super-2 number, since 2×166653537² = 55546802789220738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166653527) by changing a digit.

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, 27775587 + ... + 27775592.

It is an arithmetic number, because the mean of its divisors is an integer number (55551180).

Almost surely, 2^166653537 is an apocalyptic number.

It is an amenable number.

166653537 is a deficient number, since it is larger than the sum of its proper divisors (55551183).

166653537 is an equidigital number, since it uses as much as digits as its factorization.

166653537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55551182.

The product of its digits is 340200, while the sum is 42.

The square root of 166653537 is about 12909.4359675394. The cubic root of 166653537 is about 550.3067567016.

It can be divided in two parts, 16665 and 3537, that added together give a palindrome (20202).

The spelling of 166653537 in words is "one hundred sixty-six million, six hundred fifty-three thousand, five hundred thirty-seven".