51605580785 has 16 divisors (see below), whose sum is σ = 67560918912. Its totient is φ = 37528819200.

The previous prime is 51605580773. The next prime is 51605580787. The reversal of 51605580785 is 58708550615.

It is not a de Polignac number, because 51605580785 - 2¹² = 51605576689 is a prime.

It is a super-2 number, since 2×51605580785² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51605580787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1327292 + ... + 1365618.

It is an arithmetic number, because the mean of its divisors is an integer number (4222557432).

Almost surely, 2^51605580785 is an apocalyptic number.

51605580785 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51605580785 is a deficient number, since it is larger than the sum of its proper divisors (15955338127).

51605580785 is a wasteful number, since it uses less digits than its factorization.

51605580785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62824.

The product of its (nonzero) digits is 1680000, while the sum is 50.

The spelling of 51605580785 in words is "fifty-one billion, six hundred five million, five hundred eighty thousand, seven hundred eighty-five".