51245557670381 has 2 divisors, whose sum is σ = 51245557670382. Its totient is φ = 51245557670380.

The previous prime is 51245557670317. The next prime is 51245557670441. The reversal of 51245557670381 is 18307675554215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46783890015625 + 4461667654756 = 6839875^2 + 2112266^2 .

It is a cyclic number.

It is not a de Polignac number, because 51245557670381 - 2⁶ = 51245557670317 is a prime.

It is a super-2 number, since 2×51245557670381² (a number of 28 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 51245557670381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51245557670081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25622778835190 + 25622778835191.

It is an arithmetic number, because the mean of its divisors is an integer number (25622778835191).

Almost surely, 2^{51245557670381} is an apocalyptic number.

It is an amenable number.

51245557670381 is a deficient number, since it is larger than the sum of its proper divisors (1).

51245557670381 is an equidigital number, since it uses as much as digits as its factorization.

51245557670381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280000, while the sum is 59.

The spelling of 51245557670381 in words is "fifty-one trillion, two hundred forty-five billion, five hundred fifty-seven million, six hundred seventy thousand, three hundred eighty-one".