320767445561 has 4 divisors (see below), whose sum is σ = 320797811712. Its totient is φ = 320737079412.

The previous prime is 320767445533. The next prime is 320767445567. The reversal of 320767445561 is 165544767023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320767445561 - 2⁶ = 320767445497 is a prime.

It is a super-3 number, since 3×320767445561³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320767445567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15167225 + ... + 15188358.

It is an arithmetic number, because the mean of its divisors is an integer number (80199452928).

Almost surely, 2^320767445561 is an apocalyptic number.

It is an amenable number.

320767445561 is a deficient number, since it is larger than the sum of its proper divisors (30366151).

320767445561 is a wasteful number, since it uses less digits than its factorization.

320767445561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30366150.

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 320767445561 in words is "three hundred twenty billion, seven hundred sixty-seven million, four hundred forty-five thousand, five hundred sixty-one".