2661550687 has 4 divisors (see below), whose sum is σ = 2687902776. Its totient is φ = 2635198600.

The previous prime is 2661550669. The next prime is 2661550691. The reversal of 2661550687 is 7860551662.

2661550687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661550687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661550657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13175893 + ... + 13176094.

It is an arithmetic number, because the mean of its divisors is an integer number (671975694).

Almost surely, 2^2661550687 is an apocalyptic number.

2661550687 is a deficient number, since it is larger than the sum of its proper divisors (26352089).

2661550687 is a wasteful number, since it uses less digits than its factorization.

2661550687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26352088.

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 2661550687 is about 51590.2189082388. The cubic root of 2661550687 is about 1385.8351754409.

The spelling of 2661550687 in words is "two billion, six hundred sixty-one million, five hundred fifty thousand, six hundred eighty-seven".