166355501 has 4 divisors (see below), whose sum is σ = 179152092. Its totient is φ = 153558912.

The previous prime is 166355477. The next prime is 166355503. The reversal of 166355501 is 105553661.

166355501 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 an emirpimes, since its reverse is a distinct semiprime: 105553661 = 307 ⋅343823.

It can be written as a sum of positive squares in 2 ways, for example, as 28879876 + 137475625 = 5374^2 + 11725^2 .

It is a de Polignac number, because none of the positive numbers 2^k-166355501 is a prime.

It is a super-2 number, since 2×166355501² = 55348305425922002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166355503) 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, 6398276 + ... + 6398301.

It is an arithmetic number, because the mean of its divisors is an integer number (44788023).

Almost surely, 2^166355501 is an apocalyptic number.

It is an amenable number.

166355501 is a deficient number, since it is larger than the sum of its proper divisors (12796591).

166355501 is a wasteful number, since it uses less digits than its factorization.

166355501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12796590.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 166355501 is about 12897.8874626816. The cubic root of 166355501 is about 549.9785126592.

The spelling of 166355501 in words is "one hundred sixty-six million, three hundred fifty-five thousand, five hundred one".