66474542818 has 16 divisors (see below), whose sum is σ = 100015243776. Its totient is φ = 33136240320.

The previous prime is 66474542809. The next prime is 66474542839. The reversal of 66474542818 is 81824547466.

66474542818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66474542818² (a number of 22 digits) contains 22 as substring.

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, 1199530 + ... + 1253722.

It is an arithmetic number, because the mean of its divisors is an integer number (6250952736).

Almost surely, 2^66474542818 is an apocalyptic number.

66474542818 is a deficient number, since it is larger than the sum of its proper divisors (33540700958).

66474542818 is a wasteful number, since it uses less digits than its factorization.

66474542818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56049.

The product of its digits is 10321920, while the sum is 55.

The spelling of 66474542818 in words is "sixty-six billion, four hundred seventy-four million, five hundred forty-two thousand, eight hundred eighteen".