216642503 has 32 divisors (see below), whose sum is σ = 285795840. Its totient is φ = 159096960.

The previous prime is 216642487. The next prime is 216642521. The reversal of 216642503 is 305246612.

It is not a de Polignac number, because 216642503 - 2⁴ = 216642487 is a prime.

It is a super-2 number, since 2×216642503² = 93867948212210018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216642523) 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 31 ways as a sum of consecutive naturals, for example, 545501 + ... + 545897.

It is an arithmetic number, because the mean of its divisors is an integer number (8931120).

Almost surely, 2^216642503 is an apocalyptic number.

216642503 is a deficient number, since it is larger than the sum of its proper divisors (69153337).

216642503 is a wasteful number, since it uses less digits than its factorization.

216642503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 216642503 is about 14718.7806220488. The cubic root of 216642503 is about 600.5943212945.

The spelling of 216642503 in words is "two hundred sixteen million, six hundred forty-two thousand, five hundred three".