2645687766 has 16 divisors (see below), whose sum is σ = 5295939264. Its totient is φ = 881135304.

The previous prime is 2645687741. The next prime is 2645687773. The reversal of 2645687766 is 6677865462.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182596 + ... + 196551.

It is an arithmetic number, because the mean of its divisors is an integer number (330996204).

Almost surely, 2^2645687766 is an apocalyptic number.

2645687766 is an abundant number, since it is smaller than the sum of its proper divisors (2650251498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2645687766 is a wasteful number, since it uses less digits than its factorization.

2645687766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380315.

The product of its digits is 20321280, while the sum is 57.

The square root of 2645687766 is about 51436.2495327954. The cubic root of 2645687766 is about 1383.0764812838.

The spelling of 2645687766 in words is "two billion, six hundred forty-five million, six hundred eighty-seven thousand, seven hundred sixty-six".