66840804058 has 12 divisors (see below), whose sum is σ = 116630382762. Its totient is φ = 28646058840.

The previous prime is 66840804053. The next prime is 66840804067. The reversal of 66840804058 is 85040804866.

66840804058 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 44924074209 + 21916729849 = 211953^2 + 148043^2 .

It is a super-3 number, since 3×66840804058³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (66840804053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 341024413 + ... + 341024608.

Almost surely, 2^66840804058 is an apocalyptic number.

66840804058 is a deficient number, since it is larger than the sum of its proper divisors (49789578704).

66840804058 is a wasteful number, since it uses less digits than its factorization.

66840804058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682049037 (or 682049030 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 49.

The spelling of 66840804058 in words is "sixty-six billion, eight hundred forty million, eight hundred four thousand, fifty-eight".