1647819942066 has 12 divisors (see below), whose sum is σ = 3570276541182. Its totient is φ = 549273314016.

The previous prime is 1647819942047. The next prime is 1647819942079. The reversal of 1647819942066 is 6602499187461.

1647819942066 is a `hidden beast` number, since 1 + 6 + 47 + 81 + 99 + 420 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1289053683225 + 358766258841 = 1135365^2 + 598971^2 .

It is a super-2 number, since 2×1647819942066² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1647819941994 and 1647819942012.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45772776151 + ... + 45772776186.

Almost surely, 2^{1647819942066} is an apocalyptic number.

1647819942066 is an abundant number, since it is smaller than the sum of its proper divisors (1922456599116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1647819942066 is a wasteful number, since it uses less digits than its factorization.

1647819942066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91545552345 (or 91545552342 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 1647819942066 in words is "one trillion, six hundred forty-seven billion, eight hundred nineteen million, nine hundred forty-two thousand, sixty-six".