51205663 has 2 divisors, whose sum is σ = 51205664. Its totient is φ = 51205662.

The previous prime is 51205639. The next prime is 51205699. The reversal of 51205663 is 36650215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51205663 - 2²¹ = 49108511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51205603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25602831 + 25602832.

It is an arithmetic number, because the mean of its divisors is an integer number (25602832).

Almost surely, 2^51205663 is an apocalyptic number.

51205663 is a deficient number, since it is larger than the sum of its proper divisors (1).

51205663 is an equidigital number, since it uses as much as digits as its factorization.

51205663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 51205663 is about 7155.8132312128. The cubic root of 51205663 is about 371.3407964539.

Adding to 51205663 its reverse (36650215), we get a palindrome (87855878).

The spelling of 51205663 in words is "fifty-one million, two hundred five thousand, six hundred sixty-three".