2142801661 has 32 divisors (see below), whose sum is σ = 2893363200. Its totient is φ = 1532537280.

The previous prime is 2142801659. The next prime is 2142801719. The reversal of 2142801661 is 1661082412.

It is a cyclic number.

It is not a de Polignac number, because 2142801661 - 2¹ = 2142801659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142801061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173200 + ... + 185158.

It is an arithmetic number, because the mean of its divisors is an integer number (90417600).

Almost surely, 2^2142801661 is an apocalyptic number.

It is an amenable number.

2142801661 is a deficient number, since it is larger than the sum of its proper divisors (750561539).

2142801661 is a wasteful number, since it uses less digits than its factorization.

2142801661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12169.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 2142801661 is about 46290.4057121992. The cubic root of 2142801661 is about 1289.2208625623.

The spelling of 2142801661 in words is "two billion, one hundred forty-two million, eight hundred one thousand, six hundred sixty-one".