66556350331 has 4 divisors (see below), whose sum is σ = 66560755464. Its totient is φ = 66551945200.

The previous prime is 66556350319. The next prime is 66556350347. The reversal of 66556350331 is 13305365566.

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

It is a cyclic number.

It is not a de Polignac number, because 66556350331 - 2⁵ = 66556350299 is a prime.

It is a super-2 number, since 2×66556350331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66556350431) 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, 2179825 + ... + 2210146.

It is an arithmetic number, because the mean of its divisors is an integer number (16640188866).

Almost surely, 2^66556350331 is an apocalyptic number.

66556350331 is a deficient number, since it is larger than the sum of its proper divisors (4405133).

66556350331 is a wasteful number, since it uses less digits than its factorization.

66556350331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405132.

The product of its (nonzero) digits is 729000, while the sum is 43.

The spelling of 66556350331 in words is "sixty-six billion, five hundred fifty-six million, three hundred fifty thousand, three hundred thirty-one".