101661666505 has 16 divisors (see below), whose sum is σ = 139780143360. Its totient is φ = 69531642432.

The previous prime is 101661666499. The next prime is 101661666539. The reversal of 101661666505 is 505666166101.

It is not a de Polignac number, because 101661666505 - 2³ = 101661666497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3719829 + ... + 3747058.

It is an arithmetic number, because the mean of its divisors is an integer number (8736258960).

Almost surely, 2^101661666505 is an apocalyptic number.

It is an amenable number.

101661666505 is a deficient number, since it is larger than the sum of its proper divisors (38118476855).

101661666505 is an equidigital number, since it uses as much as digits as its factorization.

101661666505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7467288.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 101661666505 in words is "one hundred one billion, six hundred sixty-one million, six hundred sixty-six thousand, five hundred five".