2125781434569 has 24 divisors (see below), whose sum is σ = 3062255908096. Its totient is φ = 1303964532000.

The previous prime is 2125781434541. The next prime is 2125781434627. The reversal of 2125781434569 is 9654341875212.

It is a happy number.

It is not a de Polignac number, because 2125781434569 - 2⁸ = 2125781434313 is a prime.

It is a super-2 number, since 2×2125781434569² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2125781433569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3490344 + ... + 4053894.

Almost surely, 2^{2125781434569} is an apocalyptic number.

It is an amenable number.

2125781434569 is a deficient number, since it is larger than the sum of its proper divisors (936474473527).

2125781434569 is an equidigital number, since it uses as much as digits as its factorization.

2125781434569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564189 (or 563878 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 57.

The spelling of 2125781434569 in words is "two trillion, one hundred twenty-five billion, seven hundred eighty-one million, four hundred thirty-four thousand, five hundred sixty-nine".