25765386197 has 8 divisors (see below), whose sum is σ = 26757567000. Its totient is φ = 24780120064.

The previous prime is 25765386181. The next prime is 25765386217. The reversal of 25765386197 is 79168356752.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5353263556 + 20412122641 = 73166^2 + 142871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25765386197 - 2⁴ = 25765386181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25765386797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1721072 + ... + 1735977.

It is an arithmetic number, because the mean of its divisors is an integer number (3344695875).

Almost surely, 2^25765386197 is an apocalyptic number.

It is an amenable number.

25765386197 is a deficient number, since it is larger than the sum of its proper divisors (992180803).

25765386197 is a wasteful number, since it uses less digits than its factorization.

25765386197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3457335.

The product of its digits is 19051200, while the sum is 59.

Adding to 25765386197 its sum of digits (59), we get a square (25765386256 = 160516²).

The spelling of 25765386197 in words is "twenty-five billion, seven hundred sixty-five million, three hundred eighty-six thousand, one hundred ninety-seven".