13978525266 has 20 divisors (see below), whose sum is σ = 31322251422. Its totient is φ = 4659508368.

The previous prime is 13978525243. The next prime is 13978525273. The reversal of 13978525266 is 66252587931.

13978525266 is a `hidden beast` number, since 1 + 3 + 97 + 8 + 525 + 26 + 6 = 666.

13978525266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 13729043241 + 249482025 = 117171^2 + 15795^2 .

It is a super-2 number, since 2×13978525266² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43143435 + ... + 43143758.

Almost surely, 2^13978525266 is an apocalyptic number.

13978525266 is an abundant number, since it is smaller than the sum of its proper divisors (17343726156).

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

13978525266 is an equidigital number, since it uses as much as digits as its factorization.

13978525266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86287207 (or 86287198 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 13978525266 in words is "thirteen billion, nine hundred seventy-eight million, five hundred twenty-five thousand, two hundred sixty-six".