658368661 has 4 divisors (see below), whose sum is σ = 659778912. Its totient is φ = 656958412.

The previous prime is 658368649. The next prime is 658368709. The reversal of 658368661 is 166863856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 658368661 - 2¹⁹ = 657844373 is a prime.

It is a super-4 number, since 4×658368661⁴ (a number of 36 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (658368461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704425 + ... + 705358.

It is an arithmetic number, because the mean of its divisors is an integer number (164944728).

Almost surely, 2^658368661 is an apocalyptic number.

It is an amenable number.

658368661 is a deficient number, since it is larger than the sum of its proper divisors (1410251).

658368661 is a wasteful number, since it uses less digits than its factorization.

658368661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410250.

The product of its digits is 1244160, while the sum is 49.

The square root of 658368661 is about 25658.6956215627. The cubic root of 658368661 is about 869.9408340440.

The spelling of 658368661 in words is "six hundred fifty-eight million, three hundred sixty-eight thousand, six hundred sixty-one".