3644421256436 has 24 divisors (see below), whose sum is σ = 6496346586240. Its totient is φ = 1788422347712.

The previous prime is 3644421256433. The next prime is 3644421256447. The reversal of 3644421256436 is 6346521244463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644421256433) 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, 12368540 + ... + 12659763.

It is an arithmetic number, because the mean of its divisors is an integer number (270681107760).

Almost surely, 2^{3644421256436} is an apocalyptic number.

It is an amenable number.

3644421256436 is a deficient number, since it is larger than the sum of its proper divisors (2851925329804).

3644421256436 is a wasteful number, since it uses less digits than its factorization.

3644421256436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25028983 (or 25028981 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 50.

The spelling of 3644421256436 in words is "three trillion, six hundred forty-four billion, four hundred twenty-one million, two hundred fifty-six thousand, four hundred thirty-six".