129783633476644 has 81 divisors (see below), whose sum is σ = 266986038250323. Its totient is φ = 55041577145856.

The previous prime is 129783633476621. The next prime is 129783633476669. The reversal of 129783633476644 is 446674336387921.

The square root of 129783633476644 is 11392262.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 16188793660900 + 113594839815744 = 4023530^2 + 10658088^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15470687602 + ... + 15470695990.

Almost surely, 2^{129783633476644} is an apocalyptic number.

129783633476644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

129783633476644 is the 11392262-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129783633476644

129783633476644 is an abundant number, since it is smaller than the sum of its proper divisors (137202404773679).

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

129783633476644 is an frugal number, since it uses more digits than its factorization.

129783633476644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16990 (or 8495 counting only the distinct ones).

The product of its digits is 2633637888, while the sum is 73.

The spelling of 129783633476644 in words is "one hundred twenty-nine trillion, seven hundred eighty-three billion, six hundred thirty-three million, four hundred seventy-six thousand, six hundred forty-four".