100500661 has 2 divisors, whose sum is σ = 100500662. Its totient is φ = 100500660.

The previous prime is 100500643. The next prime is 100500677. The reversal of 100500661 is 166005001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100500625 + 36 = 10025^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 100500661 - 2⁵ = 100500629 is a prime.

It is a super-2 number, since 2×100500661² = 20200765722873842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100500161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50250330 + 50250331.

It is an arithmetic number, because the mean of its divisors is an integer number (50250331).

Almost surely, 2^100500661 is an apocalyptic number.

It is an amenable number.

100500661 is a deficient number, since it is larger than the sum of its proper divisors (1).

100500661 is an equidigital number, since it uses as much as digits as its factorization.

100500661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 100500661 is about 10025.0017955111. The cubic root of 100500661 is about 464.9322150392.

Adding to 100500661 its reverse (166005001), we get a palindrome (266505662).

The spelling of 100500661 in words is "one hundred million, five hundred thousand, six hundred sixty-one".