66100550001 has 16 divisors (see below), whose sum is σ = 89317831680. Its totient is φ = 43477301120.

The previous prime is 66100549979. The next prime is 66100550053. The reversal of 66100550001 is 10005500166.

It is a cyclic number.

It is not a de Polignac number, because 66100550001 - 2⁵ = 66100549969 is a prime.

It is a super-2 number, since 2×66100550001² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66100550081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145425 + ... + 391598.

It is an arithmetic number, because the mean of its divisors is an integer number (5582364480).

Almost surely, 2^66100550001 is an apocalyptic number.

It is an amenable number.

66100550001 is a deficient number, since it is larger than the sum of its proper divisors (23217281679).

66100550001 is a wasteful number, since it uses less digits than its factorization.

66100550001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537576.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 66100550001 in words is "sixty-six billion, one hundred million, five hundred fifty thousand, one".