129206225385 has 20 divisors (see below), whose sum is σ = 231614123268. Its totient is φ = 68909986656.

The previous prime is 129206225381. The next prime is 129206225399. The reversal of 129206225385 is 583522602921.

129206225385 is a `hidden beast` number, since 1 + 2 + 92 + 0 + 6 + 22 + 538 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 85830249024 + 43375976361 = 292968^2 + 208269^2 .

It is not a de Polignac number, because 129206225385 - 2² = 129206225381 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 129206225385.

It is not an unprimeable number, because it can be changed into a prime (129206225381) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 159513454 + ... + 159514263.

Almost surely, 2^129206225385 is an apocalyptic number.

129206225385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129206225385 is a deficient number, since it is larger than the sum of its proper divisors (102407897883).

129206225385 is an equidigital number, since it uses as much as digits as its factorization.

129206225385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319027734 (or 319027725 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 129206225385 in words is "one hundred twenty-nine billion, two hundred six million, two hundred twenty-five thousand, three hundred eighty-five".