51406430320505 has 8 divisors (see below), whose sum is σ = 66432925337352. Its totient is φ = 37961671621248.

The previous prime is 51406430320471. The next prime is 51406430320549. The reversal of 51406430320505 is 50502303460415.

It can be written as a sum of positive squares in 4 ways, for example, as 662192317504 + 50744238003001 = 813752^2 + 7123499^2 .

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 51406430320505 - 2²⁸ = 51406161885049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395434079324 + ... + 395434079453.

It is an arithmetic number, because the mean of its divisors is an integer number (8304115667169).

Almost surely, 2^{51406430320505} is an apocalyptic number.

It is an amenable number.

51406430320505 is a deficient number, since it is larger than the sum of its proper divisors (15026495016847).

51406430320505 is a wasteful number, since it uses less digits than its factorization.

51406430320505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790868158795.

The product of its (nonzero) digits is 216000, while the sum is 38.

The spelling of 51406430320505 in words is "fifty-one trillion, four hundred six billion, four hundred thirty million, three hundred twenty thousand, five hundred five".