51661561060003 has 2 divisors, whose sum is σ = 51661561060004. Its totient is φ = 51661561060002.

The previous prime is 51661561060001. The next prime is 51661561060013. The reversal of 51661561060003 is 30006016516615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51661561060003 - 2¹ = 51661561060001 is a prime.

Together with 51661561060001, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51661561060001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25830780530001 + 25830780530002.

It is an arithmetic number, because the mean of its divisors is an integer number (25830780530002).

Almost surely, 2^{51661561060003} is an apocalyptic number.

51661561060003 is a deficient number, since it is larger than the sum of its proper divisors (1).

51661561060003 is an equidigital number, since it uses as much as digits as its factorization.

51661561060003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 40.

Adding to 51661561060003 its reverse (30006016516615), we get a palindrome (81667577576618).

The spelling of 51661561060003 in words is "fifty-one trillion, six hundred sixty-one billion, five hundred sixty-one million, sixty thousand, three".