51685773357705 has 32 divisors (see below), whose sum is σ = 83118345260544. Its totient is φ = 27425380958976.

The previous prime is 51685773357703. The next prime is 51685773357733. The reversal of 51685773357705 is 50775337758615.

It is not a de Polignac number, because 51685773357705 - 2¹ = 51685773357703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51685773357705.

It is not an unprimeable number, because it can be changed into a prime (51685773357703) 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, 281569984 + ... + 281753486.

It is an arithmetic number, because the mean of its divisors is an integer number (2597448289392).

Almost surely, 2^{51685773357705} is an apocalyptic number.

It is an amenable number.

51685773357705 is a deficient number, since it is larger than the sum of its proper divisors (31432571902839).

51685773357705 is a wasteful number, since it uses less digits than its factorization.

51685773357705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279025.

The product of its (nonzero) digits is 648270000, while the sum is 69.

The spelling of 51685773357705 in words is "fifty-one trillion, six hundred eighty-five billion, seven hundred seventy-three million, three hundred fifty-seven thousand, seven hundred five".