166345766 has 4 divisors (see below), whose sum is σ = 249518652. Its totient is φ = 83172882.

The previous prime is 166345759. The next prime is 166345787. The reversal of 166345766 is 667543661.

166345766 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 an emirpimes, since its reverse is a distinct semiprime: 667543661 = 8521 ⋅78341.

It is a super-2 number, since 2×166345766² = 55341827732253512, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41586440 + ... + 41586443.

It is an arithmetic number, because the mean of its divisors is an integer number (62379663).

Almost surely, 2^166345766 is an apocalyptic number.

166345766 is a deficient number, since it is larger than the sum of its proper divisors (83172886).

166345766 is an equidigital number, since it uses as much as digits as its factorization.

166345766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83172885.

The product of its digits is 544320, while the sum is 44.

The square root of 166345766 is about 12897.5100697770. The cubic root of 166345766 is about 549.9677843389.

The spelling of 166345766 in words is "one hundred sixty-six million, three hundred forty-five thousand, seven hundred sixty-six".