2161717143425 has 48 divisors (see below), whose sum is σ = 3131327772672. Its totient is φ = 1449536212800.

The previous prime is 2161717143413. The next prime is 2161717143433. The reversal of 2161717143425 is 5243417171612.

It is not a de Polignac number, because 2161717143425 - 2⁶ = 2161717143361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9519254 + ... + 9743696.

It is an arithmetic number, because the mean of its divisors is an integer number (65235995264).

Almost surely, 2^{2161717143425} is an apocalyptic number.

2161717143425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2161717143425 is a deficient number, since it is larger than the sum of its proper divisors (969610629247).

2161717143425 is a wasteful number, since it uses less digits than its factorization.

2161717143425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225678 (or 225673 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The spelling of 2161717143425 in words is "two trillion, one hundred sixty-one billion, seven hundred seventeen million, one hundred forty-three thousand, four hundred twenty-five".