401878686413 has 2 divisors, whose sum is σ = 401878686414. Its totient is φ = 401878686412.

The previous prime is 401878686397. The next prime is 401878686437. The reversal of 401878686413 is 314686878104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292765402084 + 109113284329 = 541078^2 + 330323^2 .

It is a cyclic number.

It is not a de Polignac number, because 401878686413 - 2⁴ = 401878686397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401878686493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200939343206 + 200939343207.

It is an arithmetic number, because the mean of its divisors is an integer number (200939343207).

Almost surely, 2^401878686413 is an apocalyptic number.

It is an amenable number.

401878686413 is a deficient number, since it is larger than the sum of its proper divisors (1).

401878686413 is an equidigital number, since it uses as much as digits as its factorization.

401878686413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 401878686413 in words is "four hundred one billion, eight hundred seventy-eight million, six hundred eighty-six thousand, four hundred thirteen".