401878686416 has 10 divisors (see below), whose sum is σ = 778639954962. Its totient is φ = 200939343200.

The previous prime is 401878686413. The next prime is 401878686437. The reversal of 401878686416 is 614686878104.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 206606611600 + 195272074816 = 454540^2 + 441896^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401878686413) 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, 12558708935 + ... + 12558708966.

Almost surely, 2^401878686416 is an apocalyptic number.

It is an amenable number.

401878686416 is a deficient number, since it is larger than the sum of its proper divisors (376761268546).

401878686416 is a wasteful number, since it uses less digits than its factorization.

401878686416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25117417909 (or 25117417903 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 59.

The spelling of 401878686416 in words is "four hundred one billion, eight hundred seventy-eight million, six hundred eighty-six thousand, four hundred sixteen".