25278667545 has 16 divisors (see below), whose sum is σ = 40447838592. Its totient is φ = 13481299200.

The previous prime is 25278667543. The next prime is 25278667567. The reversal of 25278667545 is 54576687252.

It is not a de Polignac number, because 25278667545 - 2¹ = 25278667543 is a prime.

It is a super-2 number, since 2×25278667545² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25278667543) 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, 592945 + ... + 634145.

It is an arithmetic number, because the mean of its divisors is an integer number (2527989912).

Almost surely, 2^25278667545 is an apocalyptic number.

It is an amenable number.

25278667545 is a deficient number, since it is larger than the sum of its proper divisors (15169171047).

25278667545 is a wasteful number, since it uses less digits than its factorization.

25278667545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82112.

The product of its digits is 28224000, while the sum is 57.

The spelling of 25278667545 in words is "twenty-five billion, two hundred seventy-eight million, six hundred sixty-seven thousand, five hundred forty-five".