216231337057 has 2 divisors, whose sum is σ = 216231337058. Its totient is φ = 216231337056.

The previous prime is 216231337043. The next prime is 216231337081. The reversal of 216231337057 is 750733132612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193310588241 + 22920748816 = 439671^2 + 151396^2 .

It is a cyclic number.

It is not a de Polignac number, because 216231337057 - 2¹⁹ = 216230812769 is a prime.

It is a super-2 number, since 2×216231337057² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216231377057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108115668528 + 108115668529.

It is an arithmetic number, because the mean of its divisors is an integer number (108115668529).

Almost surely, 2^216231337057 is an apocalyptic number.

It is an amenable number.

216231337057 is a deficient number, since it is larger than the sum of its proper divisors (1).

216231337057 is an equidigital number, since it uses as much as digits as its factorization.

216231337057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 40.

Adding to 216231337057 its reverse (750733132612), we get a palindrome (966964469669).

The spelling of 216231337057 in words is "two hundred sixteen billion, two hundred thirty-one million, three hundred thirty-seven thousand, fifty-seven".