101666393 has 2 divisors, whose sum is σ = 101666394. Its totient is φ = 101666392.

The previous prime is 101666363. The next prime is 101666399. The reversal of 101666393 is 393666101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71284249 + 30382144 = 8443^2 + 5512^2 .

It is an emirp because it is prime and its reverse (393666101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101666393 - 2²⁰ = 100617817 is a prime.

It is not a weakly prime, because it can be changed into another prime (101666399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50833196 + 50833197.

It is an arithmetic number, because the mean of its divisors is an integer number (50833197).

Almost surely, 2^101666393 is an apocalyptic number.

It is an amenable number.

101666393 is a deficient number, since it is larger than the sum of its proper divisors (1).

101666393 is an equidigital number, since it uses as much as digits as its factorization.

101666393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 101666393 is about 10082.9754041156. The cubic root of 101666393 is about 466.7229303478.

The spelling of 101666393 in words is "one hundred one million, six hundred sixty-six thousand, three hundred ninety-three".