154551533461681 has 2 divisors, whose sum is σ = 154551533461682. Its totient is φ = 154551533461680.

The previous prime is 154551533461667. The next prime is 154551533461739. The reversal of 154551533461681 is 186164335155451.

It is an a-pointer prime, because the next prime (154551533461739) can be obtained adding 154551533461681 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137586237440656 + 16965296021025 = 11729716^2 + 4118895^2 .

It is a cyclic number.

It is not a de Polignac number, because 154551533461681 - 2²⁷ = 154551399243953 is a prime.

It is a super-2 number, since 2×154551533461681² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (154551530461681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77275766730840 + 77275766730841.

It is an arithmetic number, because the mean of its divisors is an integer number (77275766730841).

Almost surely, 2^{154551533461681} is an apocalyptic number.

It is an amenable number.

154551533461681 is a deficient number, since it is larger than the sum of its proper divisors (1).

154551533461681 is an equidigital number, since it uses as much as digits as its factorization.

154551533461681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920000, while the sum is 58.

The spelling of 154551533461681 in words is "one hundred fifty-four trillion, five hundred fifty-one billion, five hundred thirty-three million, four hundred sixty-one thousand, six hundred eighty-one".