3256638718542 has 64 divisors (see below), whose sum is σ = 7483120208640. Its totient is φ = 934450387200.

The previous prime is 3256638718519. The next prime is 3256638718577. The reversal of 3256638718542 is 2458178366523.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1847692 + ... + 3150752.

It is an arithmetic number, because the mean of its divisors is an integer number (116923753260).

Almost surely, 2^{3256638718542} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3256638718542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3741560104320).

3256638718542 is an abundant number, since it is smaller than the sum of its proper divisors (4226481490098).

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

3256638718542 is a wasteful number, since it uses less digits than its factorization.

3256638718542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305089.

The product of its digits is 58060800, while the sum is 60.

The spelling of 3256638718542 in words is "three trillion, two hundred fifty-six billion, six hundred thirty-eight million, seven hundred eighteen thousand, five hundred forty-two".