53651615021 has 2 divisors, whose sum is σ = 53651615022. Its totient is φ = 53651615020.

The previous prime is 53651614963. The next prime is 53651615071. The reversal of 53651615021 is 12051615635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40429144900 + 13222470121 = 201070^2 + 114989^2 .

It is a cyclic number.

It is not a de Polignac number, because 53651615021 - 2⁶ = 53651614957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53651615071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26825807510 + 26825807511.

It is an arithmetic number, because the mean of its divisors is an integer number (26825807511).

Almost surely, 2^53651615021 is an apocalyptic number.

It is an amenable number.

53651615021 is a deficient number, since it is larger than the sum of its proper divisors (1).

53651615021 is an equidigital number, since it uses as much as digits as its factorization.

53651615021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 53651615021 in words is "fifty-three billion, six hundred fifty-one million, six hundred fifteen thousand, twenty-one".