140521666 has 16 divisors (see below), whose sum is σ = 212486400. Its totient is φ = 69695568.

The previous prime is 140521639. The next prime is 140521679. The reversal of 140521666 is 666125041.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226705 + ... + 227323.

It is an arithmetic number, because the mean of its divisors is an integer number (13280400).

Almost surely, 2^140521666 is an apocalyptic number.

140521666 is a deficient number, since it is larger than the sum of its proper divisors (71964734).

140521666 is a wasteful number, since it uses less digits than its factorization.

140521666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 140521666 is about 11854.1834809488. The cubic root of 140521666 is about 519.8935506954.

The spelling of 140521666 in words is "one hundred forty million, five hundred twenty-one thousand, six hundred sixty-six".