6663658 has 4 divisors (see below), whose sum is σ = 9995490. Its totient is φ = 3331828.

The previous prime is 6663653. The next prime is 6663673. The reversal of 6663658 is 8563666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8563666 = 2 ⋅4281833.

It can be written as a sum of positive squares in only one way, i.e., 5774409 + 889249 = 2403^2 + 943^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6663658.

It is not an unprimeable number, because it can be changed into a prime (6663653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665913 + ... + 1665916.

Almost surely, 2^6663658 is an apocalyptic number.

6663658 is a deficient number, since it is larger than the sum of its proper divisors (3331832).

6663658 is a wasteful number, since it uses less digits than its factorization.

6663658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331831.

The product of its digits is 155520, while the sum is 40.

The square root of 6663658 is about 2581.4062059273. The cubic root of 6663658 is about 188.1788888787.

The spelling of 6663658 in words is "six million, six hundred sixty-three thousand, six hundred fifty-eight".