129126485820 has 48 divisors (see below), whose sum is σ = 361651641120. Its totient is φ = 34424445696.

The previous prime is 129126485797. The next prime is 129126485843. The reversal of 129126485820 is 28584621921.

It is an interprime number because it is at equal distance from previous prime (129126485797) and next prime (129126485843).

It is a super-2 number, since 2×129126485820² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129126485820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64275 + ... + 512234.

It is an arithmetic number, because the mean of its divisors is an integer number (7534409190).

Almost surely, 2^129126485820 is an apocalyptic number.

129126485820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129126485820 is an abundant number, since it is smaller than the sum of its proper divisors (232525155300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129126485820 is a wasteful number, since it uses less digits than its factorization.

129126485820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580254 (or 580252 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 129126485820 in words is "one hundred twenty-nine billion, one hundred twenty-six million, four hundred eighty-five thousand, eight hundred twenty".