1066411415721 has 16 divisors (see below), whose sum is σ = 1483936773120. Its totient is φ = 679923248400.

The previous prime is 1066411415711. The next prime is 1066411415747. The reversal of 1066411415721 is 1275141146601.

It is not a de Polignac number, because 1066411415721 - 2¹⁹ = 1066410891433 is a prime.

It is a super-2 number, since 2×1066411415721² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1066411415721.

It is not an unprimeable number, because it can be changed into a prime (1066411415701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 776455 + ... + 1653996.

It is an arithmetic number, because the mean of its divisors is an integer number (92746048320).

Almost surely, 2^{1066411415721} is an apocalyptic number.

It is an amenable number.

1066411415721 is a deficient number, since it is larger than the sum of its proper divisors (417525357399).

1066411415721 is a wasteful number, since it uses less digits than its factorization.

1066411415721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436836.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 1066411415721 in words is "one trillion, sixty-six billion, four hundred eleven million, four hundred fifteen thousand, seven hundred twenty-one".