401878686401 has 4 divisors (see below), whose sum is σ = 401885601492. Its totient is φ = 401871771312.

The previous prime is 401878686397. The next prime is 401878686413. The reversal of 401878686401 is 104686878104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 322692163600 + 79186522801 = 568060^2 + 281401^2 .

It is a cyclic number.

It is not a de Polignac number, because 401878686401 - 2² = 401878686397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401878686481) 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 in 3 ways as a sum of consecutive naturals, for example, 3369626 + ... + 3486851.

It is an arithmetic number, because the mean of its divisors is an integer number (100471400373).

Almost surely, 2^401878686401 is an apocalyptic number.

It is an amenable number.

401878686401 is a deficient number, since it is larger than the sum of its proper divisors (6915091).

401878686401 is an equidigital number, since it uses as much as digits as its factorization.

401878686401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6915090.

The product of its (nonzero) digits is 2064384, while the sum is 53.

The spelling of 401878686401 in words is "four hundred one billion, eight hundred seventy-eight million, six hundred eighty-six thousand, four hundred one".