25640311383437 has 2 divisors, whose sum is σ = 25640311383438. Its totient is φ = 25640311383436.

The previous prime is 25640311383419. The next prime is 25640311383509. The reversal of 25640311383437 is 73438311304652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24192960425956 + 1447350957481 = 4918634^2 + 1203059^2 .

It is a cyclic number.

It is not a de Polignac number, because 25640311383437 - 2¹² = 25640311379341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25640311382437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820155691718 + 12820155691719.

It is an arithmetic number, because the mean of its divisors is an integer number (12820155691719).

Almost surely, 2^{25640311383437} is an apocalyptic number.

It is an amenable number.

25640311383437 is a deficient number, since it is larger than the sum of its proper divisors (1).

25640311383437 is an equidigital number, since it uses as much as digits as its factorization.

25640311383437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 25640311383437 in words is "twenty-five trillion, six hundred forty billion, three hundred eleven million, three hundred eighty-three thousand, four hundred thirty-seven".