1171665621601 has 16 divisors (see below), whose sum is σ = 1263230398080. Its totient is φ = 1082682881280.

The previous prime is 1171665621583. The next prime is 1171665621671. The reversal of 1171665621601 is 1061265661711.

It is a cyclic number.

It is not a de Polignac number, because 1171665621601 - 2¹⁷ = 1171665490529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1171665621671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465541 + ... + 1600018.

It is an arithmetic number, because the mean of its divisors is an integer number (78951899880).

Almost surely, 2^{1171665621601} is an apocalyptic number.

It is an amenable number.

1171665621601 is a deficient number, since it is larger than the sum of its proper divisors (91564776479).

1171665621601 is a wasteful number, since it uses less digits than its factorization.

1171665621601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066184.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 1171665621601 in words is "one trillion, one hundred seventy-one billion, six hundred sixty-five million, six hundred twenty-one thousand, six hundred one".