25206376381 has 2 divisors, whose sum is σ = 25206376382. Its totient is φ = 25206376380.

The previous prime is 25206376333. The next prime is 25206376399. The reversal of 25206376381 is 18367360252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24584672025 + 621704356 = 156795^2 + 24934^2 .

It is a cyclic number.

It is not a de Polignac number, because 25206376381 - 2³³ = 16616441789 is a prime.

It is a super-2 number, since 2×25206376381² (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 (25206376681) 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, 12603188190 + 12603188191.

It is an arithmetic number, because the mean of its divisors is an integer number (12603188191).

Almost surely, 2^25206376381 is an apocalyptic number.

It is an amenable number.

25206376381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25206376381 is an equidigital number, since it uses as much as digits as its factorization.

25206376381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 25206376381 in words is "twenty-five billion, two hundred six million, three hundred seventy-six thousand, three hundred eighty-one".