13925467791581 has 2 divisors, whose sum is σ = 13925467791582. Its totient is φ = 13925467791580.

The previous prime is 13925467791509. The next prime is 13925467791617. The reversal of 13925467791581 is 18519776452931.

13925467791581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13436110180900 + 489357610681 = 3665530^2 + 699541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13925467791581 is a prime.

It is a super-2 number, since 2×13925467791581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13925467797581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6962733895790 + 6962733895791.

It is an arithmetic number, because the mean of its divisors is an integer number (6962733895791).

Almost surely, 2^{13925467791581} is an apocalyptic number.

It is an amenable number.

13925467791581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13925467791581 is an equidigital number, since it uses as much as digits as its factorization.

13925467791581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 114307200, while the sum is 68.

The spelling of 13925467791581 in words is "thirteen trillion, nine hundred twenty-five billion, four hundred sixty-seven million, seven hundred ninety-one thousand, five hundred eighty-one".