340320552521 has 16 divisors (see below), whose sum is σ = 356895978768. Its totient is φ = 324229248000.

The previous prime is 340320552499. The next prime is 340320552529. The reversal of 340320552521 is 125255023043.

It can be written as a sum of positive squares in 8 ways, for example, as 6996025 + 340313556496 = 2645^2 + 583364^2 .

It is a cyclic number.

It is not a de Polignac number, because 340320552521 - 2¹⁰ = 340320551497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340320552529) 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, 260606 + ... + 865191.

It is an arithmetic number, because the mean of its divisors is an integer number (22305998673).

Almost surely, 2^340320552521 is an apocalyptic number.

It is an amenable number.

340320552521 is a deficient number, since it is larger than the sum of its proper divisors (16575426247).

340320552521 is a wasteful number, since it uses less digits than its factorization.

340320552521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126012.

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 340320552521 its reverse (125255023043), we get a palindrome (465575575564).

The spelling of 340320552521 in words is "three hundred forty billion, three hundred twenty million, five hundred fifty-two thousand, five hundred twenty-one".