6634643949 has 12 divisors (see below), whose sum is σ = 9584195712. Its totient is φ = 4422717000.

The previous prime is 6634643923. The next prime is 6634644001. The reversal of 6634643949 is 9493464366.

It is a de Polignac number, because none of the positive numbers 2^k-6634643949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6634643895 and 6634643904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6634663949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115204 + ... + 162914.

It is an arithmetic number, because the mean of its divisors is an integer number (798682976).

Almost surely, 2^6634643949 is an apocalyptic number.

It is an amenable number.

6634643949 is a deficient number, since it is larger than the sum of its proper divisors (2949551763).

6634643949 is a wasteful number, since it uses less digits than its factorization.

6634643949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63168 (or 63165 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 54.

The square root of 6634643949 is about 81453.3237443384. The cubic root of 6634643949 is about 1879.0537667904.

The spelling of 6634643949 in words is "six billion, six hundred thirty-four million, six hundred forty-three thousand, nine hundred forty-nine".