140166681 has 4 divisors (see below), whose sum is σ = 186888912. Its totient is φ = 93444452.

The previous prime is 140166679. The next prime is 140166703. The reversal of 140166681 is 186661041.

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 140166681 - 2¹ = 140166679 is a prime.

It is a super-2 number, since 2×140166681² = 39293396925111522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140166641) 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, 23361111 + ... + 23361116.

It is an arithmetic number, because the mean of its divisors is an integer number (46722228).

Almost surely, 2^140166681 is an apocalyptic number.

It is an amenable number.

140166681 is a deficient number, since it is larger than the sum of its proper divisors (46722231).

140166681 is an equidigital number, since it uses as much as digits as its factorization.

140166681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46722230.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 140166681 is about 11839.2010287857. The cubic root of 140166681 is about 519.4553975323.

The spelling of 140166681 in words is "one hundred forty million, one hundred sixty-six thousand, six hundred eighty-one".