1666574436656 has 10 divisors (see below), whose sum is σ = 3228987971052. Its totient is φ = 833287218320.

The previous prime is 1666574436629. The next prime is 1666574436727. The reversal of 1666574436656 is 6566344756661.

It is a junction number, because it is equal to n+sod(n) for n = 1666574436592 and 1666574436601.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52080451130 + ... + 52080451161.

Almost surely, 2^{1666574436656} is an apocalyptic number.

1666574436656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666574436656 is a deficient number, since it is larger than the sum of its proper divisors (1562413534396).

1666574436656 is a wasteful number, since it uses less digits than its factorization.

1666574436656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104160902299 (or 104160902293 counting only the distinct ones).

The product of its digits is 391910400, while the sum is 65.

The spelling of 1666574436656 in words is "one trillion, six hundred sixty-six billion, five hundred seventy-four million, four hundred thirty-six thousand, six hundred fifty-six".