129685291742 has 4 divisors (see below), whose sum is σ = 194527937616. Its totient is φ = 64842645870.

The previous prime is 129685291739. The next prime is 129685291759. The reversal of 129685291742 is 247192586921.

129685291742 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 32421322934 + ... + 32421322937.

It is an arithmetic number, because the mean of its divisors is an integer number (48631984404).

Almost surely, 2^129685291742 is an apocalyptic number.

129685291742 is a deficient number, since it is larger than the sum of its proper divisors (64842645874).

129685291742 is an equidigital number, since it uses as much as digits as its factorization.

129685291742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64842645873.

The product of its digits is 4354560, while the sum is 56.

The spelling of 129685291742 in words is "one hundred twenty-nine billion, six hundred eighty-five million, two hundred ninety-one thousand, seven hundred forty-two".