320561511215 has 16 divisors (see below), whose sum is σ = 441730696320. Its totient is φ = 220865346720.

The previous prime is 320561511209. The next prime is 320561511223. The reversal of 320561511215 is 512115165023.

It is not a de Polignac number, because 320561511215 - 2⁸ = 320561510959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153377669 + ... + 153379758.

It is an arithmetic number, because the mean of its divisors is an integer number (27608168520).

Almost surely, 2^320561511215 is an apocalyptic number.

320561511215 is a deficient number, since it is larger than the sum of its proper divisors (121169185105).

320561511215 is a wasteful number, since it uses less digits than its factorization.

320561511215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306757462.

The product of its (nonzero) digits is 9000, while the sum is 32.

Adding to 320561511215 its reverse (512115165023), we get a palindrome (832676676238).

The spelling of 320561511215 in words is "three hundred twenty billion, five hundred sixty-one million, five hundred eleven thousand, two hundred fifteen".