140006661 has 16 divisors (see below), whose sum is σ = 189177984. Its totient is φ = 92094464.

The previous prime is 140006623. The next prime is 140006663. The reversal of 140006661 is 166600041.

It is a cyclic number.

It is not a de Polignac number, because 140006661 - 2⁶ = 140006597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140006663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86320 + ... + 87926.

It is an arithmetic number, because the mean of its divisors is an integer number (11823624).

Almost surely, 2^140006661 is an apocalyptic number.

It is an amenable number.

140006661 is a deficient number, since it is larger than the sum of its proper divisors (49171323).

140006661 is a wasteful number, since it uses less digits than its factorization.

140006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 140006661 is about 11832.4410414758. The cubic root of 140006661 is about 519.2576451029.

The spelling of 140006661 in words is "one hundred forty million, six thousand, six hundred sixty-one".