155486626523681 has 2 divisors, whose sum is σ = 155486626523682. Its totient is φ = 155486626523680.

The previous prime is 155486626523659. The next prime is 155486626523699. The reversal of 155486626523681 is 186325626684551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135273554672656 + 20213071851025 = 11630716^2 + 4495895^2 .

It is a cyclic number.

It is not a de Polignac number, because 155486626523681 - 2¹⁰ = 155486626522657 is a prime.

It is a super-2 number, since 2×155486626523681² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155486626523981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77743313261840 + 77743313261841.

It is an arithmetic number, because the mean of its divisors is an integer number (77743313261841).

Almost surely, 2^{155486626523681} is an apocalyptic number.

It is an amenable number.

155486626523681 is a deficient number, since it is larger than the sum of its proper divisors (1).

155486626523681 is an equidigital number, since it uses as much as digits as its factorization.

155486626523681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664000, while the sum is 68.

The spelling of 155486626523681 in words is "one hundred fifty-five trillion, four hundred eighty-six billion, six hundred twenty-six million, five hundred twenty-three thousand, six hundred eighty-one".