6643699057 has 8 divisors (see below), whose sum is σ = 6740375552. Its totient is φ = 6547716000.

The previous prime is 6643699037. The next prime is 6643699079. The reversal of 6643699057 is 7509963466.

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 6643699057 - 2²³ = 6635310449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6643698989 and 6643699007.

It is not an unprimeable number, because it can be changed into a prime (6643699037) 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, 154044 + ... + 192397.

It is an arithmetic number, because the mean of its divisors is an integer number (842546944).

Almost surely, 2^6643699057 is an apocalyptic number.

It is an amenable number.

6643699057 is a deficient number, since it is larger than the sum of its proper divisors (96676495).

6643699057 is a wasteful number, since it uses less digits than its factorization.

6643699057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346719.

The product of its (nonzero) digits is 7348320, while the sum is 55.

The square root of 6643699057 is about 81508.8894354475. The cubic root of 6643699057 is about 1879.9082361465.

The spelling of 6643699057 in words is "six billion, six hundred forty-three million, six hundred ninety-nine thousand, fifty-seven".