129379773636 has 63 divisors (see below), whose sum is σ = 339517585533. Its totient is φ = 43120116720.

The previous prime is 129379773631. The next prime is 129379773659. The reversal of 129379773636 is 636377973921.

The square root of 129379773636 is 359694.

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

It can be written as a sum of positive squares in only one way, i.e., 121727023236 + 7652750400 = 348894^2 + 87480^2 .

It is a super-2 number, since 2×129379773636² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129379773631) by changing a digit.

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 20 ways as a sum of consecutive naturals, for example, 19420146 + ... + 19426806.

Almost surely, 2^129379773636 is an apocalyptic number.

129379773636 is the 359694-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129379773636

129379773636 is an abundant number, since it is smaller than the sum of its proper divisors (210137811897).

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

129379773636 is an frugal number, since it uses more digits than its factorization.

129379773636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13344 (or 6666 counting only the distinct ones).

The product of its digits is 54010152, while the sum is 63.

The spelling of 129379773636 in words is "one hundred twenty-nine billion, three hundred seventy-nine million, seven hundred seventy-three thousand, six hundred thirty-six".