6643927051 has 2 divisors, whose sum is σ = 6643927052. Its totient is φ = 6643927050.

The previous prime is 6643927013. The next prime is 6643927061. The reversal of 6643927051 is 1507293466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6643927051 - 2⁷ = 6643926923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6643926989 and 6643927007.

It is not a weakly prime, because it can be changed into another prime (6643927061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321963525 + 3321963526.

It is an arithmetic number, because the mean of its divisors is an integer number (3321963526).

Almost surely, 2^6643927051 is an apocalyptic number.

6643927051 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643927051 is an equidigital number, since it uses as much as digits as its factorization.

6643927051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 6643927051 is about 81510.2880070976. The cubic root of 6643927051 is about 1879.9297403764.

The spelling of 6643927051 in words is "six billion, six hundred forty-three million, nine hundred twenty-seven thousand, fifty-one".