2561550765 has 16 divisors (see below), whose sum is σ = 4099356096. Its totient is φ = 1365868800.

The previous prime is 2561550751. The next prime is 2561550829. The reversal of 2561550765 is 5670551652.

It is a happy number.

2561550765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561550765 - 2⁴ = 2561550749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67350 + ... + 98280.

It is an arithmetic number, because the mean of its divisors is an integer number (256209756).

Almost surely, 2^2561550765 is an apocalyptic number.

It is an amenable number.

2561550765 is a deficient number, since it is larger than the sum of its proper divisors (1537805331).

2561550765 is a wasteful number, since it uses less digits than its factorization.

2561550765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36460.

The product of its (nonzero) digits is 315000, while the sum is 42.

The square root of 2561550765 is about 50611.7650848101. The cubic root of 2561550765 is about 1368.2569277139.

The spelling of 2561550765 in words is "two billion, five hundred sixty-one million, five hundred fifty thousand, seven hundred sixty-five".