16818312501 has 32 divisors (see below), whose sum is σ = 25365459840. Its totient is φ = 11010556800.

The previous prime is 16818312473. The next prime is 16818312509. The reversal of 16818312501 is 10521381861.

16818312501 is a `hidden beast` number, since 1 + 68 + 1 + 83 + 12 + 501 = 666.

It is not a de Polignac number, because 16818312501 - 2¹⁸ = 16818050357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16818312509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1051081 + ... + 1066961.

It is an arithmetic number, because the mean of its divisors is an integer number (792670620).

Almost surely, 2^16818312501 is an apocalyptic number.

It is an amenable number.

16818312501 is a deficient number, since it is larger than the sum of its proper divisors (8547147339).

16818312501 is a wasteful number, since it uses less digits than its factorization.

16818312501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16594 (or 16588 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 16818312501 in words is "sixteen billion, eight hundred eighteen million, three hundred twelve thousand, five hundred one".