25401163693 has 2 divisors, whose sum is σ = 25401163694. Its totient is φ = 25401163692.

The previous prime is 25401163681. The next prime is 25401163787. The reversal of 25401163693 is 39636110452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22910455044 + 2490708649 = 151362^2 + 49907^2 .

It is a cyclic number.

It is not a de Polignac number, because 25401163693 - 2¹³ = 25401155501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25401163633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12700581846 + 12700581847.

It is an arithmetic number, because the mean of its divisors is an integer number (12700581847).

Almost surely, 2^25401163693 is an apocalyptic number.

It is an amenable number.

25401163693 is a deficient number, since it is larger than the sum of its proper divisors (1).

25401163693 is an equidigital number, since it uses as much as digits as its factorization.

25401163693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 25401163693 in words is "twenty-five billion, four hundred one million, one hundred sixty-three thousand, six hundred ninety-three".