51853503997 has 2 divisors, whose sum is σ = 51853503998. Its totient is φ = 51853503996.

The previous prime is 51853503973. The next prime is 51853504019. The reversal of 51853503997 is 79930535815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51251979321 + 601524676 = 226389^2 + 24526^2 .

It is a cyclic number.

It is not a de Polignac number, because 51853503997 - 2⁷ = 51853503869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51853503797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25926751998 + 25926751999.

It is an arithmetic number, because the mean of its divisors is an integer number (25926751999).

Almost surely, 2^51853503997 is an apocalyptic number.

It is an amenable number.

51853503997 is a deficient number, since it is larger than the sum of its proper divisors (1).

51853503997 is an equidigital number, since it uses as much as digits as its factorization.

51853503997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5103000, while the sum is 55.

The spelling of 51853503997 in words is "fifty-one billion, eight hundred fifty-three million, five hundred three thousand, nine hundred ninety-seven".