25943198401 has 2 divisors, whose sum is σ = 25943198402. Its totient is φ = 25943198400.

The previous prime is 25943198399. The next prime is 25943198419. The reversal of 25943198401 is 10489134952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24718128400 + 1225070001 = 157220^2 + 35001^2 .

It is a cyclic number.

It is not a de Polignac number, because 25943198401 - 2¹ = 25943198399 is a prime.

Together with 25943198399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25943118401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12971599200 + 12971599201.

It is an arithmetic number, because the mean of its divisors is an integer number (12971599201).

Almost surely, 2^25943198401 is an apocalyptic number.

It is an amenable number.

25943198401 is a deficient number, since it is larger than the sum of its proper divisors (1).

25943198401 is an equidigital number, since it uses as much as digits as its factorization.

25943198401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 25943198401 in words is "twenty-five billion, nine hundred forty-three million, one hundred ninety-eight thousand, four hundred one".