64138937250444 has 192 divisors, whose sum is σ = 173860868063232. Its totient is φ = 18025809984000.

The previous prime is 64138937250439. The next prime is 64138937250463. The reversal of 64138937250444 is 44405273983146.

It is a super-2 number, since 2×64138937250444² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

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 in 63 ways as a sum of consecutive naturals, for example, 839224017 + ... + 839300439.

It is an arithmetic number, because the mean of its divisors is an integer number (905525354496).

It is a 1-persistent number, because it is pandigital, but 2⋅64138937250444 = 128277874500888 is not.

Almost surely, 2^{64138937250444} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64138937250444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86930434031616).

64138937250444 is an abundant number, since it is smaller than the sum of its proper divisors (109721930812788).

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

64138937250444 is a wasteful number, since it uses less digits than its factorization.

64138937250444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77236 (or 77234 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 60.

The spelling of 64138937250444 in words is "sixty-four trillion, one hundred thirty-eight billion, nine hundred thirty-seven million, two hundred fifty thousand, four hundred forty-four".