638116265 has 8 divisors (see below), whose sum is σ = 766068360. Its totient is φ = 510273792.

The previous prime is 638116231. The next prime is 638116279. The reversal of 638116265 is 562611836.

It can be written as a sum of positive squares in 4 ways, for example, as 268861609 + 369254656 = 16397^2 + 19216^2 .

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 638116265 - 2⁸ = 638116009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14000 + ... + 38369.

It is an arithmetic number, because the mean of its divisors is an integer number (95758545).

Almost surely, 2^638116265 is an apocalyptic number.

It is an amenable number.

638116265 is a deficient number, since it is larger than the sum of its proper divisors (127952095).

638116265 is a wasteful number, since it uses less digits than its factorization.

638116265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54811.

The product of its digits is 51840, while the sum is 38.

The square root of 638116265 is about 25260.9632635020. The cubic root of 638116265 is about 860.9275484537.

The spelling of 638116265 in words is "six hundred thirty-eight million, one hundred sixteen thousand, two hundred sixty-five".