216066431 has 6 divisors (see below), whose sum is σ = 251342640. Its totient is φ = 185199756.

The previous prime is 216066407. The next prime is 216066493. The reversal of 216066431 is 134660612.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-216066431 is a prime.

It is a super-2 number, since 2×216066431² = 93369405210155522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216066394 and 216066403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216066031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2204711 + ... + 2204808.

It is an arithmetic number, because the mean of its divisors is an integer number (41890440).

Almost surely, 2^216066431 is an apocalyptic number.

216066431 is a deficient number, since it is larger than the sum of its proper divisors (35276209).

216066431 is an equidigital number, since it uses as much as digits as its factorization.

216066431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4409533 (or 4409526 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 216066431 is about 14699.1983114726. The cubic root of 216066431 is about 600.0615038804.

The spelling of 216066431 in words is "two hundred sixteen million, sixty-six thousand, four hundred thirty-one".