66631101 has 8 divisors (see below), whose sum is σ = 90731904. Its totient is φ = 43475520.

The previous prime is 66631099. The next prime is 66631133. The reversal of 66631101 is 10113666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66631101 - 2¹ = 66631099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66631141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236140 + ... + 236421.

It is an arithmetic number, because the mean of its divisors is an integer number (11341488).

Almost surely, 2^66631101 is an apocalyptic number.

It is an amenable number.

66631101 is a deficient number, since it is larger than the sum of its proper divisors (24100803).

66631101 is a wasteful number, since it uses less digits than its factorization.

66631101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472611.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 66631101 is about 8162.7875753323. The cubic root of 66631101 is about 405.4080143557.

Adding to 66631101 its reverse (10113666), we get a palindrome (76744767).

The spelling of 66631101 in words is "sixty-six million, six hundred thirty-one thousand, one hundred one".