51653435641 has 2 divisors, whose sum is σ = 51653435642. Its totient is φ = 51653435640.

The previous prime is 51653435599. The next prime is 51653435651. The reversal of 51653435641 is 14653435615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48028914025 + 3624521616 = 219155^2 + 60204^2 .

It is a cyclic number.

It is not a de Polignac number, because 51653435641 - 2⁷ = 51653435513 is a prime.

It is not a weakly prime, because it can be changed into another prime (51653435651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25826717820 + 25826717821.

It is an arithmetic number, because the mean of its divisors is an integer number (25826717821).

Almost surely, 2^51653435641 is an apocalyptic number.

It is an amenable number.

51653435641 is a deficient number, since it is larger than the sum of its proper divisors (1).

51653435641 is an equidigital number, since it uses as much as digits as its factorization.

51653435641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 43.

The spelling of 51653435641 in words is "fifty-one billion, six hundred fifty-three million, four hundred thirty-five thousand, six hundred forty-one".