218432157521057 has 2 divisors, whose sum is σ = 218432157521058. Its totient is φ = 218432157521056.

The previous prime is 218432157520999. The next prime is 218432157521099. The reversal of 218432157521057 is 750125751234812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177700204019776 + 40731953501281 = 13330424^2 + 6382159^2 .

It is a cyclic number.

It is not a de Polignac number, because 218432157521057 - 2¹² = 218432157516961 is a prime.

It is not a weakly prime, because it can be changed into another prime (218432157521657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109216078760528 + 109216078760529.

It is an arithmetic number, because the mean of its divisors is an integer number (109216078760529).

Almost surely, 2^{218432157521057} is an apocalyptic number.

It is an amenable number.

218432157521057 is a deficient number, since it is larger than the sum of its proper divisors (1).

218432157521057 is an equidigital number, since it uses as much as digits as its factorization.

218432157521057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704000, while the sum is 53.

The spelling of 218432157521057 in words is "two hundred eighteen trillion, four hundred thirty-two billion, one hundred fifty-seven million, five hundred twenty-one thousand, fifty-seven".