644730025183412 has 72 divisors (see below), whose sum is σ = 1354858885755648. Its totient is φ = 267392740204800.

The previous prime is 644730025183411. The next prime is 644730025183417. The reversal of 644730025183412 is 214381520037446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644730025183411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240839987 + ... + 243502277.

It is an arithmetic number, because the mean of its divisors is an integer number (18817484524384).

Almost surely, 2^{644730025183412} is an apocalyptic number.

644730025183412 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

644730025183412 is an abundant number, since it is smaller than the sum of its proper divisors (710128860572236).

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

644730025183412 is a wasteful number, since it uses less digits than its factorization.

644730025183412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702197 (or 2702188 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 50.

The spelling of 644730025183412 in words is "six hundred forty-four trillion, seven hundred thirty billion, twenty-five million, one hundred eighty-three thousand, four hundred twelve".