6662491578 has 12 divisors (see below), whose sum is σ = 14435398458. Its totient is φ = 2220830520.

The previous prime is 6662491567. The next prime is 6662491579. The reversal of 6662491578 is 8751942666.

It can be written as a sum of positive squares in only one way, i.e., 5331482289 + 1331009289 = 73017^2 + 36483^2 .

It is not an unprimeable number, because it can be changed into a prime (6662491579) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 185069193 + ... + 185069228.

Almost surely, 2^6662491578 is an apocalyptic number.

6662491578 is an abundant number, since it is smaller than the sum of its proper divisors (7772906880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6662491578 is a wasteful number, since it uses less digits than its factorization.

6662491578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370138429 (or 370138426 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 6662491578 is about 81624.0869964253. The cubic root of 6662491578 is about 1881.6790848299.

The spelling of 6662491578 in words is "six billion, six hundred sixty-two million, four hundred ninety-one thousand, five hundred seventy-eight".