401878686399 has 4 divisors (see below), whose sum is σ = 535838248536. Its totient is φ = 267919124264.

The previous prime is 401878686397. The next prime is 401878686413. The reversal of 401878686399 is 993686878104.

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

It is a cyclic number.

It is not a de Polignac number, because 401878686399 - 2¹ = 401878686397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401878686397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66979781064 + ... + 66979781069.

It is an arithmetic number, because the mean of its divisors is an integer number (133959562134).

Almost surely, 2^401878686399 is an apocalyptic number.

401878686399 is a deficient number, since it is larger than the sum of its proper divisors (133959562137).

401878686399 is a wasteful number, since it uses less digits than its factorization.

401878686399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133959562136.

The product of its (nonzero) digits is 125411328, while the sum is 69.

The spelling of 401878686399 in words is "four hundred one billion, eight hundred seventy-eight million, six hundred eighty-six thousand, three hundred ninety-nine".