2401664661 has 20 divisors (see below), whose sum is σ = 3913825344. Its totient is φ = 1455553800.

The previous prime is 2401664653. The next prime is 2401664687. The reversal of 2401664661 is 1664661042.

2401664661 is a `hidden beast` number, since 2 + 4 + 0 + 1 + 6 + 646 + 6 + 1 = 666.

It is not a de Polignac number, because 2401664661 - 2³ = 2401664653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2401664621) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1346845 + ... + 1348626.

Almost surely, 2^2401664661 is an apocalyptic number.

It is an amenable number.

2401664661 is a deficient number, since it is larger than the sum of its proper divisors (1512160683).

2401664661 is a wasteful number, since it uses less digits than its factorization.

2401664661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2695494 (or 2695485 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 2401664661 is about 49006.7817857896. The cubic root of 2401664661 is about 1339.1753783243.

The spelling of 2401664661 in words is "two billion, four hundred one million, six hundred sixty-four thousand, six hundred sixty-one".