129012853869 has 16 divisors (see below), whose sum is σ = 191264149440. Its totient is φ = 85948271280.

The previous prime is 129012853859. The next prime is 129012853883. The reversal of 129012853869 is 968358210921.

129012853869 is a `hidden beast` number, since 1 + 2 + 90 + 12 + 8 + 538 + 6 + 9 = 666.

It is not a de Polignac number, because 129012853869 - 2⁷ = 129012853741 is a prime.

It is a super-2 number, since 2×129012853869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129012853859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1635702 + ... + 1712759.

It is an arithmetic number, because the mean of its divisors is an integer number (11954009340).

Almost surely, 2^129012853869 is an apocalyptic number.

It is an amenable number.

129012853869 is a deficient number, since it is larger than the sum of its proper divisors (62251295571).

129012853869 is a wasteful number, since it uses less digits than its factorization.

129012853869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349897 (or 3349891 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 129012853869 in words is "one hundred twenty-nine billion, twelve million, eight hundred fifty-three thousand, eight hundred sixty-nine".