401655543517 has 2 divisors, whose sum is σ = 401655543518. Its totient is φ = 401655543516.

The previous prime is 401655543491. The next prime is 401655543623. The reversal of 401655543517 is 715345556104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366138748836 + 35516794681 = 605094^2 + 188459^2 .

It is a cyclic number.

It is not a de Polignac number, because 401655543517 - 2⁷ = 401655543389 is a prime.

It is a super-2 number, since 2×401655543517² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401655513517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200827771758 + 200827771759.

It is an arithmetic number, because the mean of its divisors is an integer number (200827771759).

Almost surely, 2^401655543517 is an apocalyptic number.

It is an amenable number.

401655543517 is a deficient number, since it is larger than the sum of its proper divisors (1).

401655543517 is an equidigital number, since it uses as much as digits as its factorization.

401655543517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260000, while the sum is 46.

The spelling of 401655543517 in words is "four hundred one billion, six hundred fifty-five million, five hundred forty-three thousand, five hundred seventeen".