6660555501 has 4 divisors (see below), whose sum is σ = 8880740672. Its totient is φ = 4440370332.

The previous prime is 6660555439. The next prime is 6660555521. The reversal of 6660555501 is 1055550666.

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 not a de Polignac number, because 6660555501 - 2⁷ = 6660555373 is a prime.

It is a super-2 number, since 2×6660555501² = 88725999163802722002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6660555501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660555521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110092581 + ... + 1110092586.

It is an arithmetic number, because the mean of its divisors is an integer number (2220185168).

Almost surely, 2^6660555501 is an apocalyptic number.

It is an amenable number.

6660555501 is a deficient number, since it is larger than the sum of its proper divisors (2220185171).

6660555501 is a wasteful number, since it uses less digits than its factorization.

6660555501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220185170.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 6660555501 is about 81612.2264185949. The cubic root of 6660555501 is about 1881.4967992441.

The spelling of 6660555501 in words is "six billion, six hundred sixty million, five hundred fifty-five thousand, five hundred one".