216126657 has 32 divisors (see below), whose sum is σ = 333852800. Its totient is φ = 138055104.

The previous prime is 216126649. The next prime is 216126689. The reversal of 216126657 is 756621612.

It is a happy number.

It is not a de Polignac number, because 216126657 - 2³ = 216126649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216122657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65319 + ... + 68547.

It is an arithmetic number, because the mean of its divisors is an integer number (10432900).

Almost surely, 2^216126657 is an apocalyptic number.

216126657 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

216126657 is a deficient number, since it is larger than the sum of its proper divisors (117726143).

216126657 is a wasteful number, since it uses less digits than its factorization.

216126657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342 (or 3336 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 216126657 is about 14701.2467838616. The cubic root of 216126657 is about 600.1172520851.

The spelling of 216126657 in words is "two hundred sixteen million, one hundred twenty-six thousand, six hundred fifty-seven".