53715123521 has 2 divisors, whose sum is σ = 53715123522. Its totient is φ = 53715123520.

The previous prime is 53715123361. The next prime is 53715123547. The reversal of 53715123521 is 12532151735.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42129615025 + 11585508496 = 205255^2 + 107636^2 .

It is a cyclic number.

It is not a de Polignac number, because 53715123521 - 2¹⁴ = 53715107137 is a prime.

It is not a weakly prime, because it can be changed into another prime (53715129521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26857561760 + 26857561761.

It is an arithmetic number, because the mean of its divisors is an integer number (26857561761).

Almost surely, 2^53715123521 is an apocalyptic number.

It is an amenable number.

53715123521 is a deficient number, since it is larger than the sum of its proper divisors (1).

53715123521 is an equidigital number, since it uses as much as digits as its factorization.

53715123521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31500, while the sum is 35.

The spelling of 53715123521 in words is "fifty-three billion, seven hundred fifteen million, one hundred twenty-three thousand, five hundred twenty-one".