216531370743469 has 2 divisors, whose sum is σ = 216531370743470. Its totient is φ = 216531370743468.

The previous prime is 216531370743451. The next prime is 216531370743599. The reversal of 216531370743469 is 964347073135612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115056472167844 + 101474898575625 = 10726438^2 + 10073475^2 .

It is a cyclic number.

It is not a de Polignac number, because 216531370743469 - 2²¹ = 216531368646317 is a prime.

It is a super-2 number, since 2×216531370743469² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216531370743869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108265685371734 + 108265685371735.

It is an arithmetic number, because the mean of its divisors is an integer number (108265685371735).

Almost surely, 2^{216531370743469} is an apocalyptic number.

It is an amenable number.

216531370743469 is a deficient number, since it is larger than the sum of its proper divisors (1).

216531370743469 is an equidigital number, since it uses as much as digits as its factorization.

216531370743469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68584320, while the sum is 61.

The spelling of 216531370743469 in words is "two hundred sixteen trillion, five hundred thirty-one billion, three hundred seventy million, seven hundred forty-three thousand, four hundred sixty-nine".