129515043842 has 4 divisors (see below), whose sum is σ = 194272565766. Its totient is φ = 64757521920.

The previous prime is 129515043821. The next prime is 129515043893. The reversal of 129515043842 is 248340515921.

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., 128650625041 + 864418801 = 358679^2 + 29401^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129515043793 and 129515043802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32378760959 + ... + 32378760962.

Almost surely, 2^129515043842 is an apocalyptic number.

129515043842 is a deficient number, since it is larger than the sum of its proper divisors (64757521924).

129515043842 is an equidigital number, since it uses as much as digits as its factorization.

129515043842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64757521923.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 129515043842 in words is "one hundred twenty-nine billion, five hundred fifteen million, forty-three thousand, eight hundred forty-two".