129553355857 has 4 divisors (see below), whose sum is σ = 130269120436. Its totient is φ = 128837591280.

The previous prime is 129553355849. The next prime is 129553355861. The reversal of 129553355857 is 758553355921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8641375681 + 120911980176 = 92959^2 + 347724^2 .

It is a cyclic number.

It is not a de Polignac number, because 129553355857 - 2³ = 129553355849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129553355807) 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, 357882018 + ... + 357882379.

It is an arithmetic number, because the mean of its divisors is an integer number (32567280109).

Almost surely, 2^129553355857 is an apocalyptic number.

It is an amenable number.

129553355857 is a deficient number, since it is larger than the sum of its proper divisors (715764579).

129553355857 is an equidigital number, since it uses as much as digits as its factorization.

129553355857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715764578.

The product of its digits is 28350000, while the sum is 58.

The spelling of 129553355857 in words is "one hundred twenty-nine billion, five hundred fifty-three million, three hundred fifty-five thousand, eight hundred fifty-seven".