2125576432781 has 2 divisors, whose sum is σ = 2125576432782. Its totient is φ = 2125576432780.

The previous prime is 2125576432739. The next prime is 2125576432799. The reversal of 2125576432781 is 1872346755212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2086100703556 + 39475729225 = 1444334^2 + 198685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2125576432781 is a prime.

It is a super-2 number, since 2×2125576432781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2125576432981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062788216390 + 1062788216391.

It is an arithmetic number, because the mean of its divisors is an integer number (1062788216391).

Almost surely, 2^{2125576432781} is an apocalyptic number.

It is an amenable number.

2125576432781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125576432781 is an equidigital number, since it uses as much as digits as its factorization.

2125576432781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5644800, while the sum is 53.

The spelling of 2125576432781 in words is "two trillion, one hundred twenty-five billion, five hundred seventy-six million, four hundred thirty-two thousand, seven hundred eighty-one".