1352265721565 has 24 divisors (see below), whose sum is σ = 1888570245240. Its totient is φ = 925615032320.

The previous prime is 1352265721451. The next prime is 1352265721589. The reversal of 1352265721565 is 5651275622531.

It can be written as a sum of positive squares in 4 ways, for example, as 39474537124 + 1312791184441 = 198682^2 + 1145771^2 .

It is not a de Polignac number, because 1352265721565 - 2⁸ = 1352265721309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65729420 + ... + 65749989.

It is an arithmetic number, because the mean of its divisors is an integer number (78690426885).

Almost surely, 2^{1352265721565} is an apocalyptic number.

It is an amenable number.

1352265721565 is a deficient number, since it is larger than the sum of its proper divisors (536304523675).

1352265721565 is a wasteful number, since it uses less digits than its factorization.

1352265721565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131479453 (or 131479442 counting only the distinct ones).

The product of its digits is 3780000, while the sum is 50.

The spelling of 1352265721565 in words is "one trillion, three hundred fifty-two billion, two hundred sixty-five million, seven hundred twenty-one thousand, five hundred sixty-five".