51611115641 has 2 divisors, whose sum is σ = 51611115642. Its totient is φ = 51611115640.

The previous prime is 51611115631. The next prime is 51611115649. The reversal of 51611115641 is 14651111615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41543000041 + 10068115600 = 203821^2 + 100340^2 .

It is a cyclic number.

It is not a de Polignac number, because 51611115641 - 2¹⁰ = 51611114617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51611115598 and 51611115607.

It is not a weakly prime, because it can be changed into another prime (51611115649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25805557820 + 25805557821.

It is an arithmetic number, because the mean of its divisors is an integer number (25805557821).

Almost surely, 2^51611115641 is an apocalyptic number.

It is an amenable number.

51611115641 is a deficient number, since it is larger than the sum of its proper divisors (1).

51611115641 is an equidigital number, since it uses as much as digits as its factorization.

51611115641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 32.

The spelling of 51611115641 in words is "fifty-one billion, six hundred eleven million, one hundred fifteen thousand, six hundred forty-one".