320546746553 has 4 divisors (see below), whose sum is σ = 349687359888. Its totient is φ = 291406133220.

The previous prime is 320546746549. The next prime is 320546746567. The reversal of 320546746553 is 355647645023.

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, and also an emirpimes, since its reverse is a distinct semiprime: 355647645023 = 11 ⋅32331604093.

It is a cyclic number.

It is not a de Polignac number, because 320546746553 - 2² = 320546746549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (320546746573) 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, 14570306651 + ... + 14570306672.

It is an arithmetic number, because the mean of its divisors is an integer number (87421839972).

Almost surely, 2^320546746553 is an apocalyptic number.

It is an amenable number.

320546746553 is a deficient number, since it is larger than the sum of its proper divisors (29140613335).

320546746553 is a wasteful number, since it uses less digits than its factorization.

320546746553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29140613334.

The product of its (nonzero) digits is 9072000, while the sum is 50.

The spelling of 320546746553 in words is "three hundred twenty billion, five hundred forty-six million, seven hundred forty-six thousand, five hundred fifty-three".