25343021437 has 2 divisors, whose sum is σ = 25343021438. Its totient is φ = 25343021436.

The previous prime is 25343021401. The next prime is 25343021447. The reversal of 25343021437 is 73412034352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19988587161 + 5354434276 = 141381^2 + 73174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25343021437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25343021447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12671510718 + 12671510719.

It is an arithmetic number, because the mean of its divisors is an integer number (12671510719).

Almost surely, 2^25343021437 is an apocalyptic number.

It is an amenable number.

25343021437 is a deficient number, since it is larger than the sum of its proper divisors (1).

25343021437 is an equidigital number, since it uses as much as digits as its factorization.

25343021437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 34.

Adding to 25343021437 its reverse (73412034352), we get a palindrome (98755055789).

The spelling of 25343021437 in words is "twenty-five billion, three hundred forty-three million, twenty-one thousand, four hundred thirty-seven".