51332372557 has 2 divisors, whose sum is σ = 51332372558. Its totient is φ = 51332372556.

The previous prime is 51332372489. The next prime is 51332372569. The reversal of 51332372557 is 75527323315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50595304356 + 737068201 = 224934^2 + 27149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51332372557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51332379557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25666186278 + 25666186279.

It is an arithmetic number, because the mean of its divisors is an integer number (25666186279).

Almost surely, 2^51332372557 is an apocalyptic number.

It is an amenable number.

51332372557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51332372557 is an equidigital number, since it uses as much as digits as its factorization.

51332372557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 661500, while the sum is 43.

The spelling of 51332372557 in words is "fifty-one billion, three hundred thirty-two million, three hundred seventy-two thousand, five hundred fifty-seven".