101666501 has 2 divisors, whose sum is σ = 101666502. Its totient is φ = 101666500.

The previous prime is 101666483. The next prime is 101666503. The reversal of 101666501 is 105666101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69472225 + 32194276 = 8335^2 + 5674^2 .

It is a cyclic number.

It is not a de Polignac number, because 101666501 - 2¹⁴ = 101650117 is a prime.

Together with 101666503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101666503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50833250 + 50833251.

It is an arithmetic number, because the mean of its divisors is an integer number (50833251).

Almost surely, 2^101666501 is an apocalyptic number.

It is an amenable number.

101666501 is a deficient number, since it is larger than the sum of its proper divisors (1).

101666501 is an equidigital number, since it uses as much as digits as its factorization.

101666501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 101666501 is about 10082.9807596762. The cubic root of 101666501 is about 466.7230956140.

The spelling of 101666501 in words is "one hundred one million, six hundred sixty-six thousand, five hundred one".