51645401621963 has 2 divisors, whose sum is σ = 51645401621964. Its totient is φ = 51645401621962.

The previous prime is 51645401621951. The next prime is 51645401622209. The reversal of 51645401621963 is 36912610454615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51645401621963 - 2¹⁸ = 51645401359819 is a prime.

It is not a weakly prime, because it can be changed into another prime (51645401620963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822700810981 + 25822700810982.

It is an arithmetic number, because the mean of its divisors is an integer number (25822700810982).

Almost surely, 2^{51645401621963} is an apocalyptic number.

51645401621963 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645401621963 is an equidigital number, since it uses as much as digits as its factorization.

51645401621963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 53.

The spelling of 51645401621963 in words is "fifty-one trillion, six hundred forty-five billion, four hundred one million, six hundred twenty-one thousand, nine hundred sixty-three".