1616666666672 has 20 divisors (see below), whose sum is σ = 3316544118216. Its totient is φ = 760784313600.

The previous prime is 1616666666663. The next prime is 1616666666677. The reversal of 1616666666672 is 2766666666161.

It is a happy number.

It is a super-2 number, since 2×1616666666672² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1616666666599 and 1616666666608.

It is not an unprimeable number, because it can be changed into a prime (1616666666677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2971813454 + ... + 2971813997.

Almost surely, 2^{1616666666672} is an apocalyptic number.

It is an amenable number.

1616666666672 is an abundant number, since it is smaller than the sum of its proper divisors (1699877451544).

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

1616666666672 is a wasteful number, since it uses less digits than its factorization.

1616666666672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943627476 (or 5943627470 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 65.

The spelling of 1616666666672 in words is "one trillion, six hundred sixteen billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy-two".