51505420305 has 32 divisors (see below), whose sum is σ = 87967779840. Its totient is φ = 25657248960.

The previous prime is 51505420303. The next prime is 51505420321. The reversal of 51505420305 is 50302450515.

It is a happy number.

It is not a de Polignac number, because 51505420305 - 2¹ = 51505420303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51505420303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1252447 + ... + 1292916.

It is an arithmetic number, because the mean of its divisors is an integer number (2748993120).

Almost surely, 2^51505420305 is an apocalyptic number.

It is an amenable number.

51505420305 is a deficient number, since it is larger than the sum of its proper divisors (36462359535).

51505420305 is a wasteful number, since it uses less digits than its factorization.

51505420305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545461.

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 51505420305 in words is "fifty-one billion, five hundred five million, four hundred twenty thousand, three hundred five".