25546946387 has 4 divisors (see below), whose sum is σ = 25572726336. Its totient is φ = 25521166440.

The previous prime is 25546946353. The next prime is 25546946393. The reversal of 25546946387 is 78364964552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25546946387 - 2¹⁶ = 25546880851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25546946587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12888488 + ... + 12890469.

It is an arithmetic number, because the mean of its divisors is an integer number (6393181584).

Almost surely, 2^25546946387 is an apocalyptic number.

25546946387 is a deficient number, since it is larger than the sum of its proper divisors (25779949).

25546946387 is an equidigital number, since it uses as much as digits as its factorization.

25546946387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25779948.

The product of its digits is 43545600, while the sum is 59.

The spelling of 25546946387 in words is "twenty-five billion, five hundred forty-six million, nine hundred forty-six thousand, three hundred eighty-seven".