6644787901 has 8 divisors (see below), whose sum is σ = 7018391520. Its totient is φ = 6273572112.

The previous prime is 6644787887. The next prime is 6644787911. The reversal of 6644787901 is 1097874466.

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 6644787901 - 2⁵ = 6644787869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644787911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591235 + ... + 602368.

It is an arithmetic number, because the mean of its divisors is an integer number (877298940).

Almost surely, 2^6644787901 is an apocalyptic number.

It is an amenable number.

6644787901 is a deficient number, since it is larger than the sum of its proper divisors (373603619).

6644787901 is a wasteful number, since it uses less digits than its factorization.

6644787901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193915.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 6644787901 is about 81515.5684578106. The cubic root of 6644787901 is about 1880.0109306932.

The spelling of 6644787901 in words is "six billion, six hundred forty-four million, seven hundred eighty-seven thousand, nine hundred one".