2575515638 has 4 divisors (see below), whose sum is σ = 3863273460. Its totient is φ = 1287757818.

The previous prime is 2575515637. The next prime is 2575515653. The reversal of 2575515638 is 8365155752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 2575515592 and 2575515601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2575515637) 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 as a sum of consecutive naturals, namely, 643878908 + ... + 643878911.

It is an arithmetic number, because the mean of its divisors is an integer number (965818365).

Almost surely, 2^2575515638 is an apocalyptic number.

2575515638 is a deficient number, since it is larger than the sum of its proper divisors (1287757822).

2575515638 is a wasteful number, since it uses less digits than its factorization.

2575515638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287757821.

The product of its digits is 1260000, while the sum is 47.

The square root of 2575515638 is about 50749.5383033186. The cubic root of 2575515638 is about 1370.7388768337.

The spelling of 2575515638 in words is "two billion, five hundred seventy-five million, five hundred fifteen thousand, six hundred thirty-eight".