66100506605 has 16 divisors (see below), whose sum is σ = 90683662080. Its totient is φ = 45310292352.

The previous prime is 66100506583. The next prime is 66100506611. The reversal of 66100506605 is 50660500166.

It is a cyclic number.

It is not a de Polignac number, because 66100506605 - 2⁸ = 66100506349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

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, 226040 + ... + 428129.

It is an arithmetic number, because the mean of its divisors is an integer number (5667728880).

Almost surely, 2^66100506605 is an apocalyptic number.

It is an amenable number.

66100506605 is a deficient number, since it is larger than the sum of its proper divisors (24583155475).

66100506605 is a wasteful number, since it uses less digits than its factorization.

66100506605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657068.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 66100506605 in words is "sixty-six billion, one hundred million, five hundred six thousand, six hundred five".