166811953 has 16 divisors (see below), whose sum is σ = 209139840. Its totient is φ = 129254400.

The previous prime is 166811927. The next prime is 166811959. The reversal of 166811953 is 359118661.

166811953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166811953 - 2²¹ = 164714801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166811959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7953 + ... + 19921.

It is an arithmetic number, because the mean of its divisors is an integer number (13071240).

Almost surely, 2^166811953 is an apocalyptic number.

It is an amenable number.

166811953 is a deficient number, since it is larger than the sum of its proper divisors (42327887).

166811953 is a wasteful number, since it uses less digits than its factorization.

166811953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12168.

The product of its digits is 38880, while the sum is 40.

The square root of 166811953 is about 12915.5701771157. The cubic root of 166811953 is about 550.4810700076.

The spelling of 166811953 in words is "one hundred sixty-six million, eight hundred eleven thousand, nine hundred fifty-three".