25245442161 has 24 divisors (see below), whose sum is σ = 37131436160. Its totient is φ = 16525360800.

The previous prime is 25245442147. The next prime is 25245442163. The reversal of 25245442161 is 16124454252.

25245442161 is a `hidden beast` number, since 2 + 5 + 2 + 454 + 42 + 161 = 666.

It is not a de Polignac number, because 25245442161 - 2¹⁵ = 25245409393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25245442163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30606 + ... + 226776.

Almost surely, 2^25245442161 is an apocalyptic number.

It is an amenable number.

25245442161 is a deficient number, since it is larger than the sum of its proper divisors (11885993999).

25245442161 is a wasteful number, since it uses less digits than its factorization.

25245442161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196437 (or 196434 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The spelling of 25245442161 in words is "twenty-five billion, two hundred forty-five million, four hundred forty-two thousand, one hundred sixty-one".