6644132655 has 16 divisors (see below), whose sum is σ = 10765178880. Its totient is φ = 3498681888.

The previous prime is 6644132641. The next prime is 6644132657. The reversal of 6644132655 is 5562314466.

It is not a de Polignac number, because 6644132655 - 2⁴ = 6644132639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644132657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2802247 + ... + 2804616.

It is an arithmetic number, because the mean of its divisors is an integer number (672823680).

Almost surely, 2^6644132655 is an apocalyptic number.

6644132655 is a deficient number, since it is larger than the sum of its proper divisors (4121046225).

6644132655 is a wasteful number, since it uses less digits than its factorization.

6644132655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5606950.

The product of its digits is 518400, while the sum is 42.

The square root of 6644132655 is about 81511.5492123662. The cubic root of 6644132655 is about 1879.9491323757.

The spelling of 6644132655 in words is "six billion, six hundred forty-four million, one hundred thirty-two thousand, six hundred fifty-five".