51630703381 has 2 divisors, whose sum is σ = 51630703382. Its totient is φ = 51630703380.

The previous prime is 51630703373. The next prime is 51630703427. The reversal of 51630703381 is 18330703615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28752628356 + 22878075025 = 169566^2 + 151255^2 .

It is a cyclic number.

It is not a de Polignac number, because 51630703381 - 2³ = 51630703373 is a prime.

It is a super-2 number, since 2×51630703381² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51630703381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51630703321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25815351690 + 25815351691.

It is an arithmetic number, because the mean of its divisors is an integer number (25815351691).

Almost surely, 2^51630703381 is an apocalyptic number.

It is an amenable number.

51630703381 is a deficient number, since it is larger than the sum of its proper divisors (1).

51630703381 is an equidigital number, since it uses as much as digits as its factorization.

51630703381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 51630703381 in words is "fifty-one billion, six hundred thirty million, seven hundred three thousand, three hundred eighty-one".