6646993601 has 4 divisors (see below), whose sum is σ = 6648890304. Its totient is φ = 6645096900.

The previous prime is 6646993589. The next prime is 6646993609. The reversal of 6646993601 is 1063996466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6646993601 - 2¹⁸ = 6646731457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6646993601.

It is not an unprimeable number, because it can be changed into a prime (6646993609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943085 + ... + 950106.

It is an arithmetic number, because the mean of its divisors is an integer number (1662222576).

Almost surely, 2^6646993601 is an apocalyptic number.

It is an amenable number.

6646993601 is a deficient number, since it is larger than the sum of its proper divisors (1896703).

6646993601 is a wasteful number, since it uses less digits than its factorization.

6646993601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896702.

The product of its (nonzero) digits is 1259712, while the sum is 50.

The square root of 6646993601 is about 81529.0966526675. The cubic root of 6646993601 is about 1880.2189273680.

The spelling of 6646993601 in words is "six billion, six hundred forty-six million, nine hundred ninety-three thousand, six hundred one".