401878686481 has 2 divisors, whose sum is σ = 401878686482. Its totient is φ = 401878686480.

The previous prime is 401878686479. The next prime is 401878686493. The reversal of 401878686481 is 184686878104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361802250000 + 40076436481 = 601500^2 + 200191^2 .

It is a cyclic number.

It is not a de Polignac number, because 401878686481 - 2¹ = 401878686479 is a prime.

It is a super-2 number, since 2×401878686481² (a number of 24 digits) contains 22 as substring.

Together with 401878686479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (401878686281) 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, 200939343240 + 200939343241.

It is an arithmetic number, because the mean of its divisors is an integer number (200939343241).

Almost surely, 2^401878686481 is an apocalyptic number.

It is an amenable number.

401878686481 is a deficient number, since it is larger than the sum of its proper divisors (1).

401878686481 is an equidigital number, since it uses as much as digits as its factorization.

401878686481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16515072, while the sum is 61.

The spelling of 401878686481 in words is "four hundred one billion, eight hundred seventy-eight million, six hundred eighty-six thousand, four hundred eighty-one".