166748681 has 8 divisors (see below), whose sum is σ = 186344928. Its totient is φ = 147892000.

The previous prime is 166748671. The next prime is 166748741. The reversal of 166748681 is 186847661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166748681 is a prime.

It is a super-2 number, since 2×166748681² = 55610245230479522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166748641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184415 + ... + 185316.

It is an arithmetic number, because the mean of its divisors is an integer number (23293116).

Almost surely, 2^166748681 is an apocalyptic number.

166748681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166748681 is a deficient number, since it is larger than the sum of its proper divisors (19596247).

166748681 is a wasteful number, since it uses less digits than its factorization.

166748681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369783.

The product of its digits is 387072, while the sum is 47.

The square root of 166748681 is about 12913.1204981600. The cubic root of 166748681 is about 550.4114618005.

It can be divided in two parts, 166 and 748681, that added together give a palindrome (748847).

The spelling of 166748681 in words is "one hundred sixty-six million, seven hundred forty-eight thousand, six hundred eighty-one".