51645401622461 has 2 divisors, whose sum is σ = 51645401622462. Its totient is φ = 51645401622460.

The previous prime is 51645401622403. The next prime is 51645401622539. The reversal of 51645401622461 is 16422610454615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48460672276900 + 3184729345561 = 6961370^2 + 1784581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51645401622461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51645401621461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822700811230 + 25822700811231.

It is an arithmetic number, because the mean of its divisors is an integer number (25822700811231).

Almost surely, 2^{51645401622461} is an apocalyptic number.

It is an amenable number.

51645401622461 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645401622461 is an equidigital number, since it uses as much as digits as its factorization.

51645401622461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 51645401622461 in words is "fifty-one trillion, six hundred forty-five billion, four hundred one million, six hundred twenty-two thousand, four hundred sixty-one".