2545261686 has 48 divisors (see below), whose sum is σ = 6031263888. Its totient is φ = 769344000.

The previous prime is 2545261651. The next prime is 2545261687. The reversal of 2545261686 is 6861625452.

2545261686 is a `hidden beast` number, since 2 + 545 + 26 + 1 + 6 + 86 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545261687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63370 + ... + 95426.

It is an arithmetic number, because the mean of its divisors is an integer number (125651331).

Almost surely, 2^2545261686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2545261686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3015631944).

2545261686 is an abundant number, since it is smaller than the sum of its proper divisors (3486002202).

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

2545261686 is a wasteful number, since it uses less digits than its factorization.

2545261686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32477 (or 32474 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 2545261686 is about 50450.5865773630. The cubic root of 2545261686 is about 1365.3504779703.

The spelling of 2545261686 in words is "two billion, five hundred forty-five million, two hundred sixty-one thousand, six hundred eighty-six".