140721666 has 32 divisors (see below), whose sum is σ = 288264960. Its totient is φ = 45776256.

The previous prime is 140721653. The next prime is 140721677. The reversal of 140721666 is 666127041.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 160020 + ... + 160896.

It is an arithmetic number, because the mean of its divisors is an integer number (9008280).

Almost surely, 2^140721666 is an apocalyptic number.

140721666 is an abundant number, since it is smaller than the sum of its proper divisors (147543294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

140721666 is a wasteful number, since it uses less digits than its factorization.

140721666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 140721666 is about 11862.6163218744. The cubic root of 140721666 is about 520.1400830682.

The spelling of 140721666 in words is "one hundred forty million, seven hundred twenty-one thousand, six hundred sixty-six".