1666554724401 has 16 divisors (see below), whose sum is σ = 2544726580224. Its totient is φ = 950361503184.

The previous prime is 1666554724391. The next prime is 1666554724427. The reversal of 1666554724401 is 1044274556661.

It is not a de Polignac number, because 1666554724401 - 2¹⁴ = 1666554708017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666554724441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81467955 + ... + 81488408.

It is an arithmetic number, because the mean of its divisors is an integer number (159045411264).

Almost surely, 2^{1666554724401} is an apocalyptic number.

It is an amenable number.

1666554724401 is a deficient number, since it is larger than the sum of its proper divisors (878171855823).

1666554724401 is a wasteful number, since it uses less digits than its factorization.

1666554724401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162956860.

The product of its (nonzero) digits is 4838400, while the sum is 51.

The spelling of 1666554724401 in words is "one trillion, six hundred sixty-six billion, five hundred fifty-four million, seven hundred twenty-four thousand, four hundred one".