218432157523057 has 4 divisors (see below), whose sum is σ = 218432230419316. Its totient is φ = 218432084626800.

The previous prime is 218432157523033. The next prime is 218432157523133. The reversal of 218432157523057 is 750325751234812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71893288378081 + 146538869144976 = 8478991^2 + 12105324^2 .

It is a cyclic number.

It is not a de Polignac number, because 218432157523057 - 2²³ = 218432149134449 is a prime.

It is a super-4 number, since 4×218432157523057⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218432157522989 and 218432157523007.

It is not an unprimeable number, because it can be changed into a prime (218432157521057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31751694 + ... + 38013607.

It is an arithmetic number, because the mean of its divisors is an integer number (54608057604829).

Almost surely, 2^{218432157523057} is an apocalyptic number.

It is an amenable number.

218432157523057 is a deficient number, since it is larger than the sum of its proper divisors (72896259).

218432157523057 is an equidigital number, since it uses as much as digits as its factorization.

218432157523057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72896258.

The product of its (nonzero) digits is 14112000, while the sum is 55.

The spelling of 218432157523057 in words is "two hundred eighteen trillion, four hundred thirty-two billion, one hundred fifty-seven million, five hundred twenty-three thousand, fifty-seven".