6344900781538 has 32 divisors (see below), whose sum is σ = 10741039240320. Its totient is φ = 2784478032000.

The previous prime is 6344900781491. The next prime is 6344900781601. The reversal of 6344900781538 is 8351870094436.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15822798 + ... + 16218838.

It is an arithmetic number, because the mean of its divisors is an integer number (335657476260).

Almost surely, 2^{6344900781538} is an apocalyptic number.

6344900781538 is a deficient number, since it is larger than the sum of its proper divisors (4396138458782).

6344900781538 is a wasteful number, since it uses less digits than its factorization.

6344900781538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421194.

The product of its (nonzero) digits is 17418240, while the sum is 58.

The spelling of 6344900781538 in words is "six trillion, three hundred forty-four billion, nine hundred million, seven hundred eighty-one thousand, five hundred thirty-eight".