51591750773 has 4 divisors (see below), whose sum is σ = 54626559660. Its totient is φ = 48556941888.

The previous prime is 51591750733. The next prime is 51591750809. The reversal of 51591750773 is 37705719515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47647031524 + 3944719249 = 218282^2 + 62807^2 .

It is a cyclic number.

It is not a de Polignac number, because 51591750773 - 2¹² = 51591746677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51591750733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1517404418 + ... + 1517404451.

It is an arithmetic number, because the mean of its divisors is an integer number (13656639915).

Almost surely, 2^51591750773 is an apocalyptic number.

It is an amenable number.

51591750773 is a deficient number, since it is larger than the sum of its proper divisors (3034808887).

51591750773 is a wasteful number, since it uses less digits than its factorization.

51591750773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034808886.

The product of its (nonzero) digits is 1157625, while the sum is 50.

The spelling of 51591750773 in words is "fifty-one billion, five hundred ninety-one million, seven hundred fifty thousand, seven hundred seventy-three".