13781974509522 has 54 divisors (see below), whose sum is σ = 29927124632613. Its totient is φ = 4583832486144.

The previous prime is 13781974509517. The next prime is 13781974509577. The reversal of 13781974509522 is 22590547918731.

It is a happy number.

13781974509522 is a `hidden beast` number, since 1 + 3 + 7 + 8 + 1 + 9 + 74 + 509 + 52 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13398740464041 + 383234045481 = 3660429^2 + 619059^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2625069.

It is a super-2 number, since 2×13781974509522² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13781974509522.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11324547058 + ... + 11324548274.

Almost surely, 2^{13781974509522} is an apocalyptic number.

13781974509522 is an abundant number, since it is smaller than the sum of its proper divisors (16145150123091).

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

13781974509522 is an frugal number, since it uses more digits than its factorization.

13781974509522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3880 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 63.

The spelling of 13781974509522 in words is "thirteen trillion, seven hundred eighty-one billion, nine hundred seventy-four million, five hundred nine thousand, five hundred twenty-two".