520355042401 has 4 divisors (see below), whose sum is σ = 520530308100. Its totient is φ = 520179776704.

The previous prime is 520355042393. The next prime is 520355042411. The reversal of 520355042401 is 104240553025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139783263376 + 380571779025 = 373876^2 + 616905^2 .

It is a cyclic number.

It is not a de Polignac number, because 520355042401 - 2³ = 520355042393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520355042411) 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, 87628396 + ... + 87634333.

It is an arithmetic number, because the mean of its divisors is an integer number (130132577025).

Almost surely, 2^520355042401 is an apocalyptic number.

It is an amenable number.

520355042401 is a deficient number, since it is larger than the sum of its proper divisors (175265699).

520355042401 is a wasteful number, since it uses less digits than its factorization.

520355042401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175265698.

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 520355042401 its reverse (104240553025), we get a palindrome (624595595426).

The spelling of 520355042401 in words is "five hundred twenty billion, three hundred fifty-five million, forty-two thousand, four hundred one".