328740535553 has 4 divisors (see below), whose sum is σ = 328741682388. Its totient is φ = 328739388720.

The previous prime is 328740535507. The next prime is 328740535577. The reversal of 328740535553 is 355535047823.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 355535047823 = 509 ⋅698497147.

It can be written as a sum of positive squares in 2 ways, for example, as 102876072049 + 225864463504 = 320743^2 + 475252^2 .

It is a cyclic number.

It is not a de Polignac number, because 328740535553 - 2⁸ = 328740535297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328740535583) 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, 274475 + ... + 856047.

It is an arithmetic number, because the mean of its divisors is an integer number (82185420597).

Almost surely, 2^328740535553 is an apocalyptic number.

It is an amenable number.

328740535553 is a deficient number, since it is larger than the sum of its proper divisors (1146835).

328740535553 is an equidigital number, since it uses as much as digits as its factorization.

328740535553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146834.

The product of its (nonzero) digits is 7560000, while the sum is 50.

The spelling of 328740535553 in words is "three hundred twenty-eight billion, seven hundred forty million, five hundred thirty-five thousand, five hundred fifty-three".