2406515661 has 48 divisors (see below), whose sum is σ = 3998791680. Its totient is φ = 1379268000.

The previous prime is 2406515603. The next prime is 2406515663. The reversal of 2406515661 is 1665156042.

2406515661 is a `hidden beast` number, since 2 + 40 + 6 + 51 + 566 + 1 = 666.

2406515661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2406515661 - 2⁷ = 2406515533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2406515663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1863426 + ... + 1864716.

It is an arithmetic number, because the mean of its divisors is an integer number (83308160).

Almost surely, 2^2406515661 is an apocalyptic number.

It is an amenable number.

2406515661 is a deficient number, since it is larger than the sum of its proper divisors (1592276019).

2406515661 is a wasteful number, since it uses less digits than its factorization.

2406515661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318 (or 2315 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 2406515661 is about 49056.2499687858. The cubic root of 2406515661 is about 1340.0764159659.

The spelling of 2406515661 in words is "two billion, four hundred six million, five hundred fifteen thousand, six hundred sixty-one".