6643427101 has 8 divisors (see below), whose sum is σ = 6756791000. Its totient is φ = 6530207040.

The previous prime is 6643427099. The next prime is 6643427113. The reversal of 6643427101 is 1017243466.

It can be written as a sum of positive squares in 4 ways, for example, as 207216025 + 6436211076 = 14395^2 + 80226^2 .

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 6643427101 - 2¹ = 6643427099 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 (6643422101) 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, 59335 + ... + 129643.

It is an arithmetic number, because the mean of its divisors is an integer number (844598875).

Almost surely, 2^6643427101 is an apocalyptic number.

6643427101 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6643427101 is a deficient number, since it is larger than the sum of its proper divisors (113363899).

6643427101 is a wasteful number, since it uses less digits than its factorization.

6643427101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71919.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 6643427101 is about 81507.2211586188. The cubic root of 6643427101 is about 1879.8825848090.

The spelling of 6643427101 in words is "six billion, six hundred forty-three million, four hundred twenty-seven thousand, one hundred one".