216438602457 has 32 divisors (see below), whose sum is σ = 359862303744. Its totient is φ = 112414305600.

The previous prime is 216438602417. The next prime is 216438602459. The reversal of 216438602457 is 754206834612.

It is not a de Polignac number, because 216438602457 - 2³² = 212143635161 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (216438602459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1169782 + ... + 1342112.

It is an arithmetic number, because the mean of its divisors is an integer number (11245696992).

Almost surely, 2^216438602457 is an apocalyptic number.

It is an amenable number.

216438602457 is a deficient number, since it is larger than the sum of its proper divisors (143423701287).

216438602457 is a wasteful number, since it uses less digits than its factorization.

216438602457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177789.

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 216438602457 in words is "two hundred sixteen billion, four hundred thirty-eight million, six hundred two thousand, four hundred fifty-seven".