25006402391 has 2 divisors, whose sum is σ = 25006402392. Its totient is φ = 25006402390.

The previous prime is 25006402313. The next prime is 25006402409. The reversal of 25006402391 is 19320460052.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25006402391 - 2¹⁴ = 25006386007 is a prime.

It is a super-2 number, since 2×25006402391² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25006402301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12503201195 + 12503201196.

It is an arithmetic number, because the mean of its divisors is an integer number (12503201196).

Almost surely, 2^25006402391 is an apocalyptic number.

25006402391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25006402391 is an equidigital number, since it uses as much as digits as its factorization.

25006402391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 25006402391 in words is "twenty-five billion, six million, four hundred two thousand, three hundred ninety-one".