129166375378 has 8 divisors (see below), whose sum is σ = 193834809468. Its totient is φ = 64554772224.

The previous prime is 129166375363. The next prime is 129166375379. The reversal of 129166375378 is 873573661921.

It can be written as a sum of positive squares in 2 ways, for example, as 125377603569 + 3788771809 = 354087^2 + 61553^2 .

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

It is not an unprimeable number, because it can be changed into a prime (129166375379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14202051 + ... + 14211142.

Almost surely, 2^129166375378 is an apocalyptic number.

129166375378 is a deficient number, since it is larger than the sum of its proper divisors (64668434090).

129166375378 is a wasteful number, since it uses less digits than its factorization.

129166375378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28415468.

The product of its digits is 11430720, while the sum is 58.

The spelling of 129166375378 in words is "one hundred twenty-nine billion, one hundred sixty-six million, three hundred seventy-five thousand, three hundred seventy-eight".