400120668865 has 8 divisors (see below), whose sum is σ = 480235274280. Its totient is φ = 320036220672.

The previous prime is 400120668799. The next prime is 400120668889. The reversal of 400120668865 is 568866021004.

It can be written as a sum of positive squares in 4 ways, for example, as 5947648641 + 394173020224 = 77121^2 + 627832^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400120668865 - 2²⁹ = 399583797953 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7510104 + ... + 7563193.

It is an arithmetic number, because the mean of its divisors is an integer number (60029409285).

Almost surely, 2^400120668865 is an apocalyptic number.

It is an amenable number.

400120668865 is a deficient number, since it is larger than the sum of its proper divisors (80114605415).

400120668865 is a wasteful number, since it uses less digits than its factorization.

400120668865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15078611.

The product of its (nonzero) digits is 552960, while the sum is 46.

Adding to 400120668865 its reverse (568866021004), we get a palindrome (968986689869).

The spelling of 400120668865 in words is "four hundred billion, one hundred twenty million, six hundred sixty-eight thousand, eight hundred sixty-five".