66166756518 has 16 divisors (see below), whose sum is σ = 132342454080. Its totient is φ = 22054095336.

The previous prime is 66166756517. The next prime is 66166756597. The reversal of 66166756518 is 81565766166.

It is a super-2 number, since 2×66166756518² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66166756517) 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, 274348 + ... + 455631.

It is an arithmetic number, because the mean of its divisors is an integer number (8271403380).

Almost surely, 2^66166756518 is an apocalyptic number.

66166756518 is an abundant number, since it is smaller than the sum of its proper divisors (66175697562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66166756518 is a wasteful number, since it uses less digits than its factorization.

66166756518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745091.

The product of its digits is 10886400, while the sum is 57.

The spelling of 66166756518 in words is "sixty-six billion, one hundred sixty-six million, seven hundred fifty-six thousand, five hundred eighteen".