51520541543 has 4 divisors (see below), whose sum is σ = 53182494528. Its totient is φ = 49858588560.

The previous prime is 51520541473. The next prime is 51520541551. The reversal of 51520541543 is 34514502515.

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

It is a cyclic number.

It is not a de Polignac number, because 51520541543 - 2¹² = 51520537447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520541143) 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, 830976446 + ... + 830976507.

It is an arithmetic number, because the mean of its divisors is an integer number (13295623632).

Almost surely, 2^51520541543 is an apocalyptic number.

51520541543 is a deficient number, since it is larger than the sum of its proper divisors (1661952985).

51520541543 is a wasteful number, since it uses less digits than its factorization.

51520541543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661952984.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 51520541543 in words is "fifty-one billion, five hundred twenty million, five hundred forty-one thousand, five hundred forty-three".