52139216120561 has 2 divisors, whose sum is σ = 52139216120562. Its totient is φ = 52139216120560.

The previous prime is 52139216120489. The next prime is 52139216120627. The reversal of 52139216120561 is 16502161293125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38649609368161 + 13489606752400 = 6216881^2 + 3672820^2 .

It is a cyclic number.

It is not a de Polignac number, because 52139216120561 - 2¹⁸ = 52139215858417 is a prime.

It is not a weakly prime, because it can be changed into another prime (52139216320561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26069608060280 + 26069608060281.

It is an arithmetic number, because the mean of its divisors is an integer number (26069608060281).

Almost surely, 2^{52139216120561} is an apocalyptic number.

It is an amenable number.

52139216120561 is a deficient number, since it is larger than the sum of its proper divisors (1).

52139216120561 is an equidigital number, since it uses as much as digits as its factorization.

52139216120561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 52139216120561 in words is "fifty-two trillion, one hundred thirty-nine billion, two hundred sixteen million, one hundred twenty thousand, five hundred sixty-one".