25619195161 has 4 divisors (see below), whose sum is σ = 29279080192. Its totient is φ = 21959310132.

The previous prime is 25619195137. The next prime is 25619195201. The reversal of 25619195161 is 16159191652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25619195161 - 2²¹ = 25617098009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25619195101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1829942505 + ... + 1829942518.

It is an arithmetic number, because the mean of its divisors is an integer number (7319770048).

Almost surely, 2^25619195161 is an apocalyptic number.

It is an amenable number.

25619195161 is a deficient number, since it is larger than the sum of its proper divisors (3659885031).

25619195161 is an equidigital number, since it uses as much as digits as its factorization.

25619195161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3659885030.

The product of its digits is 145800, while the sum is 46.

It can be divided in two parts, 25619 and 195161, that added together give a triangular number (220780 = T₆₆₄).

The spelling of 25619195161 in words is "twenty-five billion, six hundred nineteen million, one hundred ninety-five thousand, one hundred sixty-one".