2565336638 has 8 divisors (see below), whose sum is σ = 3913225560. Its totient is φ = 1260928120.

The previous prime is 2565336629. The next prime is 2565336659. The reversal of 2565336638 is 8366335652.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2565336592 and 2565336601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10869953 + ... + 10870188.

It is an arithmetic number, because the mean of its divisors is an integer number (489153195).

Almost surely, 2^2565336638 is an apocalyptic number.

2565336638 is a deficient number, since it is larger than the sum of its proper divisors (1347888922).

2565336638 is a wasteful number, since it uses less digits than its factorization.

2565336638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21740202.

The product of its digits is 2332800, while the sum is 47.

The square root of 2565336638 is about 50649.1523917232. The cubic root of 2565336638 is about 1368.9306728470.

The spelling of 2565336638 in words is "two billion, five hundred sixty-five million, three hundred thirty-six thousand, six hundred thirty-eight".