66116550511 has 8 divisors (see below), whose sum is σ = 72150382800. Its totient is φ = 60086591040.

The previous prime is 66116550503. The next prime is 66116550517. The reversal of 66116550511 is 11505561166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66116550511 - 2³ = 66116550503 is a prime.

It is a super-2 number, since 2×66116550511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66116550517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 932446 + ... + 1000843.

It is an arithmetic number, because the mean of its divisors is an integer number (9018797850).

Almost surely, 2^66116550511 is an apocalyptic number.

66116550511 is a deficient number, since it is larger than the sum of its proper divisors (6033832289).

66116550511 is a wasteful number, since it uses less digits than its factorization.

66116550511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936409.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 66116550511 in words is "sixty-six billion, one hundred sixteen million, five hundred fifty thousand, five hundred eleven".