25546136649 has 16 divisors (see below), whose sum is σ = 37190299584. Its totient is φ = 15469056000.

The previous prime is 25546136573. The next prime is 25546136711. The reversal of 25546136649 is 94663164552.

It is not a de Polignac number, because 25546136649 - 2¹³ = 25546128457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25546132649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297652 + ... + 373749.

It is an arithmetic number, because the mean of its divisors is an integer number (2324393724).

Almost surely, 2^25546136649 is an apocalyptic number.

It is an amenable number.

25546136649 is a deficient number, since it is larger than the sum of its proper divisors (11644162935).

25546136649 is a wasteful number, since it uses less digits than its factorization.

25546136649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672568.

The product of its digits is 4665600, while the sum is 51.

The spelling of 25546136649 in words is "twenty-five billion, five hundred forty-six million, one hundred thirty-six thousand, six hundred forty-nine".