25840916278381 has 2 divisors, whose sum is σ = 25840916278382. Its totient is φ = 25840916278380.

The previous prime is 25840916278361. The next prime is 25840916278421. The reversal of 25840916278381 is 18387261904852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20184272421481 + 5656643856900 = 4492691^2 + 2378370^2 .

It is a cyclic number.

It is not a de Polignac number, because 25840916278381 - 2³⁷ = 25703477324909 is a prime.

It is a super-2 number, since 2×25840916278381² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25840916278301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12920458139190 + 12920458139191.

It is an arithmetic number, because the mean of its divisors is an integer number (12920458139191).

It is a 1-persistent number, because it is pandigital, but 2⋅25840916278381 = 51681832556762 is not.

Almost surely, 2^{25840916278381} is an apocalyptic number.

It is an amenable number.

25840916278381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25840916278381 is an equidigital number, since it uses as much as digits as its factorization.

25840916278381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46448640, while the sum is 64.

The spelling of 25840916278381 in words is "twenty-five trillion, eight hundred forty billion, nine hundred sixteen million, two hundred seventy-eight thousand, three hundred eighty-one".