166901953 has 4 divisors (see below), whose sum is σ = 167061808. Its totient is φ = 166742100.

The previous prime is 166901941. The next prime is 166902013. The reversal of 166901953 is 359109661.

166901953 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 359109661 = 991 ⋅362371.

It is a cyclic number.

It is not a de Polignac number, because 166901953 - 2¹³ = 166893761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166971953) 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, 78351 + ... + 80452.

It is an arithmetic number, because the mean of its divisors is an integer number (41765452).

Almost surely, 2^166901953 is an apocalyptic number.

It is an amenable number.

166901953 is a deficient number, since it is larger than the sum of its proper divisors (159855).

166901953 is a wasteful number, since it uses less digits than its factorization.

166901953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159854.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 166901953 is about 12919.0538740265. The cubic root of 166901953 is about 550.5800525007.

The spelling of 166901953 in words is "one hundred sixty-six million, nine hundred one thousand, nine hundred fifty-three".