154681183641581 has 2 divisors, whose sum is σ = 154681183641582. Its totient is φ = 154681183641580.

The previous prime is 154681183641529. The next prime is 154681183641623. The reversal of 154681183641581 is 185146381186451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95236929441481 + 59444254200100 = 9758941^2 + 7710010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154681183641581 is a prime.

It is a super-2 number, since 2×154681183641581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154681183641521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77340591820790 + 77340591820791.

It is an arithmetic number, because the mean of its divisors is an integer number (77340591820791).

Almost surely, 2^{154681183641581} is an apocalyptic number.

It is an amenable number.

154681183641581 is a deficient number, since it is larger than the sum of its proper divisors (1).

154681183641581 is an equidigital number, since it uses as much as digits as its factorization.

154681183641581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22118400, while the sum is 62.

The spelling of 154681183641581 in words is "one hundred fifty-four trillion, six hundred eighty-one billion, one hundred eighty-three million, six hundred forty-one thousand, five hundred eighty-one".