2573521638 has 16 divisors (see below), whose sum is σ = 5159274096. Its totient is φ = 855802080.

The previous prime is 2573521631. The next prime is 2573521669. The reversal of 2573521638 is 8361253752.

It is a happy number.

2573521638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2573521638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2573521631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506881 + ... + 511932.

It is an arithmetic number, because the mean of its divisors is an integer number (322454631).

Almost surely, 2^2573521638 is an apocalyptic number.

2573521638 is an abundant number, since it is smaller than the sum of its proper divisors (2585752458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2573521638 is a wasteful number, since it uses less digits than its factorization.

2573521638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019239.

The product of its digits is 302400, while the sum is 42.

The square root of 2573521638 is about 50729.8890004699. The cubic root of 2573521638 is about 1370.3850371394.

The spelling of 2573521638 in words is "two billion, five hundred seventy-three million, five hundred twenty-one thousand, six hundred thirty-eight".