129771543386 has 4 divisors (see below), whose sum is σ = 194657315082. Its totient is φ = 64885771692.

The previous prime is 129771543379. The next prime is 129771543401. The reversal of 129771543386 is 683345177921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 77453673025 + 52317870361 = 278305^2 + 228731^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32442885845 + ... + 32442885848.

Almost surely, 2^129771543386 is an apocalyptic number.

129771543386 is a deficient number, since it is larger than the sum of its proper divisors (64885771696).

129771543386 is an equidigital number, since it uses as much as digits as its factorization.

129771543386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64885771695.

The product of its digits is 7620480, while the sum is 56.

The spelling of 129771543386 in words is "one hundred twenty-nine billion, seven hundred seventy-one million, five hundred forty-three thousand, three hundred eighty-six".