25197761873 has 2 divisors, whose sum is σ = 25197761874. Its totient is φ = 25197761872.

The previous prime is 25197761789. The next prime is 25197761903. The reversal of 25197761873 is 37816779152.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16540017664 + 8657744209 = 128608^2 + 93047^2 .

It is a cyclic number.

It is not a de Polignac number, because 25197761873 - 2¹² = 25197757777 is a prime.

It is not a weakly prime, because it can be changed into another prime (25197760873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12598880936 + 12598880937.

It is an arithmetic number, because the mean of its divisors is an integer number (12598880937).

Almost surely, 2^25197761873 is an apocalyptic number.

It is an amenable number.

25197761873 is a deficient number, since it is larger than the sum of its proper divisors (1).

25197761873 is an equidigital number, since it uses as much as digits as its factorization.

25197761873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 56.

The spelling of 25197761873 in words is "twenty-five billion, one hundred ninety-seven million, seven hundred sixty-one thousand, eight hundred seventy-three".