2545738861 has 8 divisors (see below), whose sum is σ = 2623991960. Its totient is φ = 2467983168.

The previous prime is 2545738859. The next prime is 2545738873. The reversal of 2545738861 is 1688375452.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1100978761 + 1444760100 = 33181^2 + 38010^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2545738861 - 2¹ = 2545738859 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 (2545738061) 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 7 ways as a sum of consecutive naturals, for example, 113946 + ... + 134443.

It is an arithmetic number, because the mean of its divisors is an integer number (327998995).

Almost surely, 2^2545738861 is an apocalyptic number.

It is an amenable number.

2545738861 is a deficient number, since it is larger than the sum of its proper divisors (78253099).

2545738861 is a wasteful number, since it uses less digits than its factorization.

2545738861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248703.

The product of its digits is 1612800, while the sum is 49.

The square root of 2545738861 is about 50455.3154880633. The cubic root of 2545738861 is about 1365.4357960351.

The spelling of 2545738861 in words is "two billion, five hundred forty-five million, seven hundred thirty-eight thousand, eight hundred sixty-one".