66819449546 has 16 divisors (see below), whose sum is σ = 106335144960. Its totient is φ = 31402092960.

The previous prime is 66819449491. The next prime is 66819449563. The reversal of 66819449546 is 64594491866.

It is a super-2 number, since 2×66819449546² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6918035 + ... + 6927686.

It is an arithmetic number, because the mean of its divisors is an integer number (6645946560).

Almost surely, 2^66819449546 is an apocalyptic number.

66819449546 is a deficient number, since it is larger than the sum of its proper divisors (39515695414).

66819449546 is a wasteful number, since it uses less digits than its factorization.

66819449546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13845869.

The product of its digits is 44789760, while the sum is 62.

The spelling of 66819449546 in words is "sixty-six billion, eight hundred nineteen million, four hundred forty-nine thousand, five hundred forty-six".