2661133641 has 16 divisors (see below), whose sum is σ = 3886444800. Its totient is φ = 1612153088.

The previous prime is 2661133639. The next prime is 2661133663. The reversal of 2661133641 is 1463311662.

It is a cyclic number.

It is not a de Polignac number, because 2661133641 - 2¹ = 2661133639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2661133681) 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, 898161 + ... + 901118.

It is an arithmetic number, because the mean of its divisors is an integer number (242902800).

Almost surely, 2^2661133641 is an apocalyptic number.

It is an amenable number.

2661133641 is a deficient number, since it is larger than the sum of its proper divisors (1225311159).

2661133641 is a wasteful number, since it uses less digits than its factorization.

2661133641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799328.

The product of its digits is 15552, while the sum is 33.

The square root of 2661133641 is about 51586.1768403126. The cubic root of 2661133641 is about 1385.7627881656.

The spelling of 2661133641 in words is "two billion, six hundred sixty-one million, one hundred thirty-three thousand, six hundred forty-one".