166353431 has 4 divisors (see below), whose sum is σ = 166496664. Its totient is φ = 166210200.

The previous prime is 166353377. The next prime is 166353433. The reversal of 166353431 is 134353661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134353661 = 13 ⋅10334897.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166353431 is a prime.

It is a super-2 number, since 2×166353431² = 55346928010943522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166353433) 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, 69860 + ... + 72201.

It is an arithmetic number, because the mean of its divisors is an integer number (41624166).

Almost surely, 2^166353431 is an apocalyptic number.

166353431 is a deficient number, since it is larger than the sum of its proper divisors (143233).

166353431 is a wasteful number, since it uses less digits than its factorization.

166353431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143232.

The product of its digits is 19440, while the sum is 32.

The square root of 166353431 is about 12897.8072167326. The cubic root of 166353431 is about 549.9762314797.

The spelling of 166353431 in words is "one hundred sixty-six million, three hundred fifty-three thousand, four hundred thirty-one".