25420343537 has 2 divisors, whose sum is σ = 25420343538. Its totient is φ = 25420343536.

The previous prime is 25420343489. The next prime is 25420343591. The reversal of 25420343537 is 73534302452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13063575616 + 12356767921 = 114296^2 + 111161^2 .

It is a cyclic number.

It is not a de Polignac number, because 25420343537 - 2⁸ = 25420343281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25420343537.

It is not a weakly prime, because it can be changed into another prime (25420303537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12710171768 + 12710171769.

It is an arithmetic number, because the mean of its divisors is an integer number (12710171769).

Almost surely, 2^25420343537 is an apocalyptic number.

It is an amenable number.

25420343537 is a deficient number, since it is larger than the sum of its proper divisors (1).

25420343537 is an equidigital number, since it uses as much as digits as its factorization.

25420343537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 38.

Adding to 25420343537 its reverse (73534302452), we get a palindrome (98954645989).

The spelling of 25420343537 in words is "twenty-five billion, four hundred twenty million, three hundred forty-three thousand, five hundred thirty-seven".