2775587661 has 48 divisors (see below), whose sum is σ = 5165507200. Its totient is φ = 1441851840.

The previous prime is 2775587653. The next prime is 2775587669. The reversal of 2775587661 is 1667855772.

It is a happy number.

2775587661 is a `hidden beast` number, since 27 + 7 + 558 + 7 + 6 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (2775587653) and next prime (2775587669).

It is not a de Polignac number, because 2775587661 - 2³ = 2775587653 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2775587598 and 2775587607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2775587669) 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, 37816 + ... + 83553.

Almost surely, 2^2775587661 is an apocalyptic number.

2775587661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2775587661 is a deficient number, since it is larger than the sum of its proper divisors (2389919539).

2775587661 is a wasteful number, since it uses less digits than its factorization.

2775587661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121407 (or 121390 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 54.

The square root of 2775587661 is about 52683.8463003604. The cubic root of 2775587661 is about 1405.3515684926.

The spelling of 2775587661 in words is "two billion, seven hundred seventy-five million, five hundred eighty-seven thousand, six hundred sixty-one".