51185305506 has 32 divisors (see below), whose sum is σ = 104767153920. Its totient is φ = 16662464784.

The previous prime is 51185305499. The next prime is 51185305511. The reversal of 51185305506 is 60550358115.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2533561 + ... + 2553683.

It is an arithmetic number, because the mean of its divisors is an integer number (3273973560).

Almost surely, 2^51185305506 is an apocalyptic number.

51185305506 is an abundant number, since it is smaller than the sum of its proper divisors (53581848414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51185305506 is a wasteful number, since it uses less digits than its factorization.

51185305506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30030.

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 51185305506 in words is "fifty-one billion, one hundred eighty-five million, three hundred five thousand, five hundred six".