1566666407601 has 16 divisors (see below), whose sum is σ = 2321035507200. Its totient is φ = 1044422565264.

The previous prime is 1566666407599. The next prime is 1566666407639. The reversal of 1566666407601 is 1067046666651.

It is not a de Polignac number, because 1566666407601 - 2¹ = 1566666407599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1566666407651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777735 + ... + 1933443.

It is an arithmetic number, because the mean of its divisors is an integer number (145064719200).

Almost surely, 2^{1566666407601} is an apocalyptic number.

It is an amenable number.

1566666407601 is a deficient number, since it is larger than the sum of its proper divisors (754369099599).

1566666407601 is a wasteful number, since it uses less digits than its factorization.

1566666407601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205925 (or 1205919 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 1566666407601 in words is "one trillion, five hundred sixty-six billion, six hundred sixty-six million, four hundred seven thousand, six hundred one".