129378538761 has 8 divisors (see below), whose sum is σ = 176516456160. Its totient is φ = 84246490272.

The previous prime is 129378538759. The next prime is 129378538771. The reversal of 129378538761 is 167835873921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129378538761 - 2¹ = 129378538759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129378538695 and 129378538704.

It is not an unprimeable number, because it can be changed into a prime (129378538721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501467076 + ... + 501467333.

It is an arithmetic number, because the mean of its divisors is an integer number (22064557020).

Almost surely, 2^129378538761 is an apocalyptic number.

It is an amenable number.

129378538761 is a deficient number, since it is larger than the sum of its proper divisors (47137917399).

129378538761 is a wasteful number, since it uses less digits than its factorization.

129378538761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002934455.

The product of its digits is 15240960, while the sum is 60.

The spelling of 129378538761 in words is "one hundred twenty-nine billion, three hundred seventy-eight million, five hundred thirty-eight thousand, seven hundred sixty-one".