2505739866 has 16 divisors (see below), whose sum is σ = 5727405504. Its totient is φ = 715925664.

The previous prime is 2505739861. The next prime is 2505739877. The reversal of 2505739866 is 6689375052.

It is a happy number.

2505739866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2505739861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29830195 + ... + 29830278.

It is an arithmetic number, because the mean of its divisors is an integer number (357962844).

Almost surely, 2^2505739866 is an apocalyptic number.

2505739866 is an abundant number, since it is smaller than the sum of its proper divisors (3221665638).

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

2505739866 is a wasteful number, since it uses less digits than its factorization.

2505739866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59660485.

The product of its (nonzero) digits is 2721600, while the sum is 51.

The square root of 2505739866 is about 50057.3657517053. The cubic root of 2505739866 is about 1358.2467072746.

It can be divided in two parts, 2505 and 739866, that added together give a triangular number (742371 = T₁₂₁₈).

The spelling of 2505739866 in words is "two billion, five hundred five million, seven hundred thirty-nine thousand, eight hundred sixty-six".