129515043838 has 4 divisors (see below), whose sum is σ = 194272565760. Its totient is φ = 64757521918.

The previous prime is 129515043821. The next prime is 129515043893. The reversal of 129515043838 is 838340515921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 838340515921 = 9403 ⋅89156707.

It is a junction number, because it is equal to n+sod(n) for n = 129515043791 and 129515043800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32378760958 + ... + 32378760961.

It is an arithmetic number, because the mean of its divisors is an integer number (48568141440).

Almost surely, 2^129515043838 is an apocalyptic number.

129515043838 is a deficient number, since it is larger than the sum of its proper divisors (64757521922).

129515043838 is an equidigital number, since it uses as much as digits as its factorization.

129515043838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64757521921.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 129515043838 in words is "one hundred twenty-nine billion, five hundred fifteen million, forty-three thousand, eight hundred thirty-eight".