6440207801 has 8 divisors (see below), whose sum is σ = 6830438400. Its totient is φ = 6051243328.

The previous prime is 6440207789. The next prime is 6440207803. The reversal of 6440207801 is 1087020446.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440207801 is a prime.

It is a super-2 number, since 2×6440207801² = 82952553040122511202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440207803) 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 7 ways as a sum of consecutive naturals, for example, 306041 + ... + 326406.

It is an arithmetic number, because the mean of its divisors is an integer number (853804800).

Almost surely, 2^6440207801 is an apocalyptic number.

It is an amenable number.

6440207801 is a deficient number, since it is larger than the sum of its proper divisors (390230599).

6440207801 is a wasteful number, since it uses less digits than its factorization.

6440207801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633063.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 6440207801 is about 80250.9052970744. The cubic root of 6440207801 is about 1860.5155044906.

The spelling of 6440207801 in words is "six billion, four hundred forty million, two hundred seven thousand, eight hundred one".