1321130160665 has 16 divisors (see below), whose sum is σ = 1812458626560. Its totient is φ = 905606335680.

The previous prime is 1321130160661. The next prime is 1321130160677. The reversal of 1321130160665 is 5660610311231.

It is not a de Polignac number, because 1321130160665 - 2² = 1321130160661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1321130160661) 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, 6386081 + ... + 6589710.

It is an arithmetic number, because the mean of its divisors is an integer number (113278664160).

Almost surely, 2^{1321130160665} is an apocalyptic number.

It is an amenable number.

1321130160665 is a deficient number, since it is larger than the sum of its proper divisors (491328465895).

1321130160665 is a wasteful number, since it uses less digits than its factorization.

1321130160665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12978712.

The product of its (nonzero) digits is 19440, while the sum is 35.

Adding to 1321130160665 its reverse (5660610311231), we get a palindrome (6981740471896).

The spelling of 1321130160665 in words is "one trillion, three hundred twenty-one billion, one hundred thirty million, one hundred sixty thousand, six hundred sixty-five".