66116570511 has 4 divisors (see below), whose sum is σ = 88155427352. Its totient is φ = 44077713672.

The previous prime is 66116570503. The next prime is 66116570537. The reversal of 66116570511 is 11507561166.

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

It is not a de Polignac number, because 66116570511 - 2³ = 66116570503 is a prime.

It is a super-2 number, since 2×66116570511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66116570511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66116570551) 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, 11019428416 + ... + 11019428421.

It is an arithmetic number, because the mean of its divisors is an integer number (22038856838).

Almost surely, 2^66116570511 is an apocalyptic number.

66116570511 is a deficient number, since it is larger than the sum of its proper divisors (22038856841).

66116570511 is a wasteful number, since it uses less digits than its factorization.

66116570511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22038856840.

The product of its (nonzero) digits is 37800, while the sum is 39.

The spelling of 66116570511 in words is "sixty-six billion, one hundred sixteen million, five hundred seventy thousand, five hundred eleven".