66510511171145 has 8 divisors (see below), whose sum is σ = 80348268529800. Its totient is φ = 52851305520640.

The previous prime is 66510511170923. The next prime is 66510511171151. The reversal of 66510511171145 is 54117111501566.

It can be written as a sum of positive squares in 4 ways, for example, as 1151354752144 + 65359156419001 = 1073012^2 + 8084501^2 .

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

It is not a de Polignac number, because 66510511171145 - 2¹² = 66510511167049 is a prime.

It is a super-2 number, since 2×66510511171145² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66510511171096 and 66510511171105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44637926216 + ... + 44637927705.

It is an arithmetic number, because the mean of its divisors is an integer number (10043533566225).

Almost surely, 2^{66510511171145} is an apocalyptic number.

It is an amenable number.

66510511171145 is a deficient number, since it is larger than the sum of its proper divisors (13837757358655).

66510511171145 is a wasteful number, since it uses less digits than its factorization.

66510511171145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89275854075.

The product of its (nonzero) digits is 126000, while the sum is 44.

The spelling of 66510511171145 in words is "sixty-six trillion, five hundred ten billion, five hundred eleven million, one hundred seventy-one thousand, one hundred forty-five".