51520432405 has 8 divisors (see below), whose sum is σ = 66580251192. Its totient is φ = 38045857728.

The previous prime is 51520432393. The next prime is 51520432409. The reversal of 51520432405 is 50423402515.

It can be written as a sum of positive squares in 4 ways, for example, as 671535396 + 50848897009 = 25914^2 + 225497^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51520432405 - 2²³ = 51512043797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520432409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396310954 + ... + 396311083.

It is an arithmetic number, because the mean of its divisors is an integer number (8322531399).

Almost surely, 2^51520432405 is an apocalyptic number.

It is an amenable number.

51520432405 is a deficient number, since it is larger than the sum of its proper divisors (15059818787).

51520432405 is a wasteful number, since it uses less digits than its factorization.

51520432405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792622055.

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

The spelling of 51520432405 in words is "fifty-one billion, five hundred twenty million, four hundred thirty-two thousand, four hundred five".