166663373 has 4 divisors (see below), whose sum is σ = 168281568. Its totient is φ = 165045180.

The previous prime is 166663369. The next prime is 166663403. The reversal of 166663373 is 373366661.

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: 373366661 = 16411 ⋅22751.

It is a cyclic number.

It is not a de Polignac number, because 166663373 - 2² = 166663369 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 166663373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166603373) 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, 808943 + ... + 809148.

It is an arithmetic number, because the mean of its divisors is an integer number (42070392).

Almost surely, 2^166663373 is an apocalyptic number.

It is an amenable number.

166663373 is a deficient number, since it is larger than the sum of its proper divisors (1618195).

166663373 is a wasteful number, since it uses less digits than its factorization.

166663373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618194.

The product of its digits is 244944, while the sum is 41.

The square root of 166663373 is about 12909.8169235663. The cubic root of 166663373 is about 550.3175829760.

The spelling of 166663373 in words is "one hundred sixty-six million, six hundred sixty-three thousand, three hundred seventy-three".