51261599903 has 2 divisors, whose sum is σ = 51261599904. Its totient is φ = 51261599902.

The previous prime is 51261599861. The next prime is 51261600041. The reversal of 51261599903 is 30999516215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51261599903 - 2¹⁰ = 51261598879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51261599203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630799951 + 25630799952.

It is an arithmetic number, because the mean of its divisors is an integer number (25630799952).

Almost surely, 2^51261599903 is an apocalyptic number.

51261599903 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261599903 is an equidigital number, since it uses as much as digits as its factorization.

51261599903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 656100, while the sum is 50.

The spelling of 51261599903 in words is "fifty-one billion, two hundred sixty-one million, five hundred ninety-nine thousand, nine hundred three".