6660550155601 has 4 divisors (see below), whose sum is σ = 6660728583012. Its totient is φ = 6660371728192.

The previous prime is 6660550155587. The next prime is 6660550155607. The reversal of 6660550155601 is 1065510550666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2430555832576 + 4229994323025 = 1559024^2 + 2056695^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660550155601 - 2¹⁹ = 6660549631313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660550155607) 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, 89157700 + ... + 89232373.

It is an arithmetic number, because the mean of its divisors is an integer number (1665182145753).

Almost surely, 2^{6660550155601} is an apocalyptic number.

It is an amenable number.

6660550155601 is a deficient number, since it is larger than the sum of its proper divisors (178427411).

6660550155601 is a wasteful number, since it uses less digits than its factorization.

6660550155601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178427410.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 6660550155601 in words is "six trillion, six hundred sixty billion, five hundred fifty million, one hundred fifty-five thousand, six hundred one".