140660661021 has 16 divisors (see below), whose sum is σ = 187804912128. Its totient is φ = 93645169200.

The previous prime is 140660661013. The next prime is 140660661023. The reversal of 140660661021 is 120166066041.

It is a happy number.

It is not a de Polignac number, because 140660661021 - 2³ = 140660661013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140660661023) 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, 9181650 + ... + 9196956.

It is an arithmetic number, because the mean of its divisors is an integer number (11737807008).

Almost surely, 2^140660661021 is an apocalyptic number.

It is an amenable number.

140660661021 is a deficient number, since it is larger than the sum of its proper divisors (47144251107).

140660661021 is a wasteful number, since it uses less digits than its factorization.

140660661021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19312.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 140660661021 in words is "one hundred forty billion, six hundred sixty million, six hundred sixty-one thousand, twenty-one".