6642644548 has 18 divisors (see below), whose sum is σ = 11848118954. Its totient is φ = 3258650304.

The previous prime is 6642644527. The next prime is 6642644579. The reversal of 6642644548 is 8454462466.

It can be written as a sum of positive squares in 3 ways, for example, as 4495434304 + 2147210244 = 67048^2 + 46338^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284361 + ... + 306832.

Almost surely, 2^6642644548 is an apocalyptic number.

It is an amenable number.

6642644548 is a deficient number, since it is larger than the sum of its proper divisors (5205474406).

6642644548 is a wasteful number, since it uses less digits than its factorization.

6642644548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591303 (or 591248 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 49.

The square root of 6642644548 is about 81502.4205039335. The cubic root of 6642644548 is about 1879.8087692165.

The spelling of 6642644548 in words is "six billion, six hundred forty-two million, six hundred forty-four thousand, five hundred forty-eight".