401655543623 has 2 divisors, whose sum is σ = 401655543624. Its totient is φ = 401655543622.

The previous prime is 401655543517. The next prime is 401655543637. The reversal of 401655543623 is 326345556104.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401655543623 is a prime.

It is a super-2 number, since 2×401655543623² (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 (401655543673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200827771811 + 200827771812.

It is an arithmetic number, because the mean of its divisors is an integer number (200827771812).

Almost surely, 2^401655543623 is an apocalyptic number.

401655543623 is a deficient number, since it is larger than the sum of its proper divisors (1).

401655543623 is an equidigital number, since it uses as much as digits as its factorization.

401655543623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 401655543623 in words is "four hundred one billion, six hundred fifty-five million, five hundred forty-three thousand, six hundred twenty-three".