166035993 has 4 divisors (see below), whose sum is σ = 221381328. Its totient is φ = 110690660.

The previous prime is 166035977. The next prime is 166036001. The reversal of 166035993 is 399530661.

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 166035993 - 2⁴ = 166035977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166035973) 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, 27672663 + ... + 27672668.

It is an arithmetic number, because the mean of its divisors is an integer number (55345332).

Almost surely, 2^166035993 is an apocalyptic number.

It is an amenable number.

166035993 is a deficient number, since it is larger than the sum of its proper divisors (55345335).

166035993 is an equidigital number, since it uses as much as digits as its factorization.

166035993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55345334.

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 166035993 is about 12885.4954503116. The cubic root of 166035993 is about 549.6261845560.

The spelling of 166035993 in words is "one hundred sixty-six million, thirty-five thousand, nine hundred ninety-three".