2201510661 has 24 divisors (see below), whose sum is σ = 3479026464. Its totient is φ = 1234265760.

The previous prime is 2201510653. The next prime is 2201510683. The reversal of 2201510661 is 1660151022.

It is not a de Polignac number, because 2201510661 - 2³ = 2201510653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201510651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133495 + ... + 149076.

It is an arithmetic number, because the mean of its divisors is an integer number (144959436).

Almost surely, 2^2201510661 is an apocalyptic number.

2201510661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2201510661 is a deficient number, since it is larger than the sum of its proper divisors (1277515803).

2201510661 is a wasteful number, since it uses less digits than its factorization.

2201510661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282641 (or 282634 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 2201510661 is about 46920.2585350933. The cubic root of 2201510661 is about 1300.8890685542.

Adding to 2201510661 its reverse (1660151022), we get a palindrome (3861661683).

The spelling of 2201510661 in words is "two billion, two hundred one million, five hundred ten thousand, six hundred sixty-one".