6401816755 has 16 divisors (see below), whose sum is σ = 7754307264. Its totient is φ = 5073592320.

The previous prime is 6401816747. The next prime is 6401816777. The reversal of 6401816755 is 5576181046.

It is not a de Polignac number, because 6401816755 - 2³ = 6401816747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218802 + ... + 246328.

It is an arithmetic number, because the mean of its divisors is an integer number (484644204).

Almost surely, 2^6401816755 is an apocalyptic number.

6401816755 is a deficient number, since it is larger than the sum of its proper divisors (1352490509).

6401816755 is a wasteful number, since it uses less digits than its factorization.

6401816755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27966.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 6401816755 is about 80011.3539130541. The cubic root of 6401816755 is about 1856.8111966103.

The spelling of 6401816755 in words is "six billion, four hundred one million, eight hundred sixteen thousand, seven hundred fifty-five".