66443540162 has 4 divisors (see below), whose sum is σ = 99665310246. Its totient is φ = 33221770080.

The previous prime is 66443540161. The next prime is 66443540237. The reversal of 66443540162 is 26104534466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26104534466 = 2 ⋅13052267233.

It can be written as a sum of positive squares in only one way, i.e., 40734945241 + 25708594921 = 201829^2 + 160339^2 .

It is not an unprimeable number, because it can be changed into a prime (66443540161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16610885039 + ... + 16610885042.

Almost surely, 2^66443540162 is an apocalyptic number.

66443540162 is a deficient number, since it is larger than the sum of its proper divisors (33221770084).

66443540162 is a wasteful number, since it uses less digits than its factorization.

66443540162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33221770083.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 66443540162 in words is "sixty-six billion, four hundred forty-three million, five hundred forty thousand, one hundred sixty-two".