166436461 has 4 divisors (see below), whose sum is σ = 166585792. Its totient is φ = 166287132.

The previous prime is 166436449. The next prime is 166436503. The reversal of 166436461 is 164634661.

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: 164634661 = 10937 ⋅15053.

It is a cyclic number.

It is not a de Polignac number, because 166436461 - 2²⁷ = 32218733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166436461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166436401) 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, 72981 + ... + 75226.

It is an arithmetic number, because the mean of its divisors is an integer number (41646448).

Almost surely, 2^166436461 is an apocalyptic number.

It is an amenable number.

166436461 is a deficient number, since it is larger than the sum of its proper divisors (149331).

166436461 is a wasteful number, since it uses less digits than its factorization.

166436461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149330.

The product of its digits is 62208, while the sum is 37.

The square root of 166436461 is about 12901.0255793871. The cubic root of 166436461 is about 550.0677172820.

It can be divided in two parts, 16643 and 6461, that added together give a square (23104 = 152²).

The spelling of 166436461 in words is "one hundred sixty-six million, four hundred thirty-six thousand, four hundred sixty-one".