12010661661 has 16 divisors (see below), whose sum is σ = 16214123520. Its totient is φ = 7907237040.

The previous prime is 12010661657. The next prime is 12010661699. The reversal of 12010661661 is 16616601021.

It is not a de Polignac number, because 12010661661 - 2² = 12010661657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12010661651) 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, 656050 + ... + 674108.

It is an arithmetic number, because the mean of its divisors is an integer number (1013382720).

Almost surely, 2^12010661661 is an apocalyptic number.

It is an amenable number.

12010661661 is a deficient number, since it is larger than the sum of its proper divisors (4203461859).

12010661661 is a wasteful number, since it uses less digits than its factorization.

12010661661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20816.

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 12010661661 in words is "twelve billion, ten million, six hundred sixty-one thousand, six hundred sixty-one".