51545520423 has 16 divisors (see below), whose sum is σ = 76367389440. Its totient is φ = 34362035352.

The previous prime is 51545520421. The next prime is 51545520427. The reversal of 51545520423 is 32402554515.

51545520423 is a `hidden beast` number, since 51 + 5 + 45 + 520 + 42 + 3 = 666.

It is not a de Polignac number, because 51545520423 - 2¹ = 51545520421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51545520421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843190 + ... + 902252.

It is an arithmetic number, because the mean of its divisors is an integer number (4772961840).

Almost surely, 2^51545520423 is an apocalyptic number.

51545520423 is a deficient number, since it is larger than the sum of its proper divisors (24821869017).

51545520423 is a wasteful number, since it uses less digits than its factorization.

51545520423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91395 (or 91389 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 51545520423 in words is "fifty-one billion, five hundred forty-five million, five hundred twenty thousand, four hundred twenty-three".