1345205721417 has 16 divisors (see below), whose sum is σ = 1885055262720. Its totient is φ = 851641026192.

The previous prime is 1345205721361. The next prime is 1345205721421. The reversal of 1345205721417 is 7141275025431.

It is not a de Polignac number, because 1345205721417 - 2⁸ = 1345205721161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1345205721427) 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, 70118953 + ... + 70138134.

It is an arithmetic number, because the mean of its divisors is an integer number (117815953920).

Almost surely, 2^{1345205721417} is an apocalyptic number.

It is an amenable number.

1345205721417 is a deficient number, since it is larger than the sum of its proper divisors (539849541303).

1345205721417 is a wasteful number, since it uses less digits than its factorization.

1345205721417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140257252.

The product of its (nonzero) digits is 235200, while the sum is 42.

The spelling of 1345205721417 in words is "one trillion, three hundred forty-five billion, two hundred five million, seven hundred twenty-one thousand, four hundred seventeen".