1066661616075 has 24 divisors (see below), whose sum is σ = 1923869679936. Its totient is φ = 517169268000.

The previous prime is 1066661616029. The next prime is 1066661616077. The reversal of 1066661616075 is 5706161666601.

It is a happy number.

It is not a de Polignac number, because 1066661616075 - 2⁶ = 1066661616011 is a prime.

It is a super-2 number, since 2×1066661616075² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066661616077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 646460761 + ... + 646462410.

It is an arithmetic number, because the mean of its divisors is an integer number (80161236664).

Almost surely, 2^{1066661616075} is an apocalyptic number.

1066661616075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1066661616075 is a deficient number, since it is larger than the sum of its proper divisors (857208063861).

1066661616075 is a wasteful number, since it uses less digits than its factorization.

1066661616075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292923195 (or 1292923190 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 1066661616075 in words is "one trillion, sixty-six billion, six hundred sixty-one million, six hundred sixteen thousand, seventy-five".