25385943547 has 6 divisors (see below), whose sum is σ = 25438133868. Its totient is φ = 25333767684.

The previous prime is 25385943487. The next prime is 25385943589. The reversal of 25385943547 is 74534958352.

It is not a de Polignac number, because 25385943547 - 2⁷ = 25385943419 is a prime.

It is a super-2 number, since 2×25385943547² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25385443547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3640258 + ... + 3647224.

It is an arithmetic number, because the mean of its divisors is an integer number (4239688978).

Almost surely, 2^25385943547 is an apocalyptic number.

25385943547 is a deficient number, since it is larger than the sum of its proper divisors (52190321).

25385943547 is an frugal number, since it uses more digits than its factorization.

25385943547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14457 (or 7490 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 55.

The spelling of 25385943547 in words is "twenty-five billion, three hundred eighty-five million, nine hundred forty-three thousand, five hundred forty-seven".