66616100501 has 2 divisors, whose sum is σ = 66616100502. Its totient is φ = 66616100500.

The previous prime is 66616100497. The next prime is 66616100549. The reversal of 66616100501 is 10500161666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62025902500 + 4590198001 = 249050^2 + 67751^2 .

It is a cyclic number.

It is not a de Polignac number, because 66616100501 - 2² = 66616100497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66616130501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33308050250 + 33308050251.

It is an arithmetic number, because the mean of its divisors is an integer number (33308050251).

Almost surely, 2^66616100501 is an apocalyptic number.

It is an amenable number.

66616100501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66616100501 is an equidigital number, since it uses as much as digits as its factorization.

66616100501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 66616100501 in words is "sixty-six billion, six hundred sixteen million, one hundred thousand, five hundred one".