16520273435129 has 4 divisors (see below), whose sum is σ = 16530031424676. Its totient is φ = 16510515445584.

The previous prime is 16520273435101. The next prime is 16520273435161. The reversal of 16520273435129 is 92153437202561.

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 13316076774400 + 3204196660729 = 3649120^2 + 1790027^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16520273435129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16520273435429) 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, 4878992234 + ... + 4878995619.

It is an arithmetic number, because the mean of its divisors is an integer number (4132507856169).

Almost surely, 2^{16520273435129} is an apocalyptic number.

It is an amenable number.

16520273435129 is a deficient number, since it is larger than the sum of its proper divisors (9757989547).

16520273435129 is an equidigital number, since it uses as much as digits as its factorization.

16520273435129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9757989546.

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 16520273435129 in words is "sixteen trillion, five hundred twenty billion, two hundred seventy-three million, four hundred thirty-five thousand, one hundred twenty-nine".