1666312906368 has 64 divisors (see below), whose sum is σ = 4828520365920. Its totient is φ = 504943303680.

The previous prime is 1666312906351. The next prime is 1666312906417. The reversal of 1666312906368 is 8636092136661.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1666312906368² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197239255 + ... + 197247702.

Almost surely, 2^{1666312906368} is an apocalyptic number.

It is an amenable number.

1666312906368 is an abundant number, since it is smaller than the sum of its proper divisors (3162207459552).

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

1666312906368 is a wasteful number, since it uses less digits than its factorization.

1666312906368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394486985 (or 394486973 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 57.

The spelling of 1666312906368 in words is "one trillion, six hundred sixty-six billion, three hundred twelve million, nine hundred six thousand, three hundred sixty-eight".