20125464667517 has 6 divisors (see below), whose sum is σ = 22121378518974. Its totient is φ = 18295876970360.

The previous prime is 20125464667499. The next prime is 20125464667541. The reversal of 20125464667517 is 71576646452102.

It can be written as a sum of positive squares in only one way, i.e., 16211421848281 + 3914042819236 = 4026341^2 + 1978394^2 .

It is not a de Polignac number, because 20125464667517 - 2¹⁴ = 20125464651133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125464667547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83163077018 + ... + 83163077259.

It is an arithmetic number, because the mean of its divisors is an integer number (3686896419829).

Almost surely, 2^{20125464667517} is an apocalyptic number.

It is an amenable number.

20125464667517 is a deficient number, since it is larger than the sum of its proper divisors (1995913851457).

20125464667517 is a wasteful number, since it uses less digits than its factorization.

20125464667517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166326154299 (or 166326154288 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 56.

The spelling of 20125464667517 in words is "twenty trillion, one hundred twenty-five billion, four hundred sixty-four million, six hundred sixty-seven thousand, five hundred seventeen".