51803645501 has 2 divisors, whose sum is σ = 51803645502. Its totient is φ = 51803645500.

The previous prime is 51803645461. The next prime is 51803645519. The reversal of 51803645501 is 10554630815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38298881401 + 13504764100 = 195701^2 + 116210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51803645501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51803645801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25901822750 + 25901822751.

It is an arithmetic number, because the mean of its divisors is an integer number (25901822751).

Almost surely, 2^51803645501 is an apocalyptic number.

It is an amenable number.

51803645501 is a deficient number, since it is larger than the sum of its proper divisors (1).

51803645501 is an equidigital number, since it uses as much as digits as its factorization.

51803645501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 51803645501 in words is "fifty-one billion, eight hundred three million, six hundred forty-five thousand, five hundred one".