66640227011 has 4 divisors (see below), whose sum is σ = 70147607400. Its totient is φ = 63132846624.

The previous prime is 66640226999. The next prime is 66640227023. The reversal of 66640227011 is 11072204666.

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

It is an interprime number because it is at equal distance from previous prime (66640226999) and next prime (66640227023).

It is a cyclic number.

It is not a de Polignac number, because 66640227011 - 2²⁶ = 66573118147 is a prime.

It is a super-2 number, since 2×66640227011² (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 (66640227061) 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, 1753690166 + ... + 1753690203.

It is an arithmetic number, because the mean of its divisors is an integer number (17536901850).

Almost surely, 2^66640227011 is an apocalyptic number.

66640227011 is a deficient number, since it is larger than the sum of its proper divisors (3507380389).

66640227011 is a wasteful number, since it uses less digits than its factorization.

66640227011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507380388.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 66640227011 in words is "sixty-six billion, six hundred forty million, two hundred twenty-seven thousand, eleven".