25567428721278 has 16 divisors (see below), whose sum is σ = 51135094644480. Its totient is φ = 8522436706776.

The previous prime is 25567428721139. The next prime is 25567428721279. The reversal of 25567428721278 is 87212782476552.

It is a super-2 number, since 2×25567428721278² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25567428721279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8466550 + ... + 11082297.

It is an arithmetic number, because the mean of its divisors is an integer number (3195943415280).

Almost surely, 2^{25567428721278} is an apocalyptic number.

25567428721278 is an abundant number, since it is smaller than the sum of its proper divisors (25567665923202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25567428721278 is a wasteful number, since it uses less digits than its factorization.

25567428721278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19766831.

The product of its digits is 210739200, while the sum is 66.

The spelling of 25567428721278 in words is "twenty-five trillion, five hundred sixty-seven billion, four hundred twenty-eight million, seven hundred twenty-one thousand, two hundred seventy-eight".