166291953 has 4 divisors (see below), whose sum is σ = 221722608. Its totient is φ = 110861300.

The previous prime is 166291907. The next prime is 166291973. The reversal of 166291953 is 359192661.

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 166291953 - 2⁶ = 166291889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166291903) 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, 27715323 + ... + 27715328.

It is an arithmetic number, because the mean of its divisors is an integer number (55430652).

Almost surely, 2^166291953 is an apocalyptic number.

It is an amenable number.

166291953 is a deficient number, since it is larger than the sum of its proper divisors (55430655).

166291953 is an equidigital number, since it uses as much as digits as its factorization.

166291953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55430654.

The product of its digits is 87480, while the sum is 42.

The square root of 166291953 is about 12895.4237231663. The cubic root of 166291953 is about 549.9084729238.

The spelling of 166291953 in words is "one hundred sixty-six million, two hundred ninety-one thousand, nine hundred fifty-three".