216561003 has 8 divisors (see below), whose sum is σ = 288960000. Its totient is φ = 144268008.

The previous prime is 216560999. The next prime is 216561013. The reversal of 216561003 is 300165612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216561003 - 2² = 216560999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216561013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21603 + ... + 29996.

It is an arithmetic number, because the mean of its divisors is an integer number (36120000).

Almost surely, 2^216561003 is an apocalyptic number.

216561003 is a deficient number, since it is larger than the sum of its proper divisors (72398997).

216561003 is a wasteful number, since it uses less digits than its factorization.

216561003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53001.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 216561003 is about 14716.0117898838. The cubic root of 216561003 is about 600.5189981610.

The spelling of 216561003 in words is "two hundred sixteen million, five hundred sixty-one thousand, three".