25721506161007 has 2 divisors, whose sum is σ = 25721506161008. Its totient is φ = 25721506161006.

The previous prime is 25721506160927. The next prime is 25721506161023. The reversal of 25721506161007 is 70016160512752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25721506161007 - 2³⁹ = 25171750347119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25721506161707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860753080503 + 12860753080504.

It is an arithmetic number, because the mean of its divisors is an integer number (12860753080504).

Almost surely, 2^{25721506161007} is an apocalyptic number.

25721506161007 is a deficient number, since it is larger than the sum of its proper divisors (1).

25721506161007 is an equidigital number, since it uses as much as digits as its factorization.

25721506161007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

Adding to 25721506161007 its reverse (70016160512752), we get a palindrome (95737666673759).

The spelling of 25721506161007 in words is "twenty-five trillion, seven hundred twenty-one billion, five hundred six million, one hundred sixty-one thousand, seven".