53815573513 has 4 divisors (see below), whose sum is σ = 57955233028. Its totient is φ = 49675914000.

The previous prime is 53815573477. The next prime is 53815573531. The reversal of 53815573513 is 31537551835.

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 23951586169 + 29863987344 = 154763^2 + 172812^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53815573513 is a prime.

It is a super-2 number, since 2×53815573513² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53815573013) 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, 2069829738 + ... + 2069829763.

It is an arithmetic number, because the mean of its divisors is an integer number (14488808257).

Almost surely, 2^53815573513 is an apocalyptic number.

It is an amenable number.

53815573513 is a deficient number, since it is larger than the sum of its proper divisors (4139659515).

53815573513 is a wasteful number, since it uses less digits than its factorization.

53815573513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139659514.

The product of its digits is 945000, while the sum is 46.

The spelling of 53815573513 in words is "fifty-three billion, eight hundred fifteen million, five hundred seventy-three thousand, five hundred thirteen".