66651101 has 16 divisors (see below), whose sum is σ = 78262848. Its totient is φ = 56083200.

The previous prime is 66651089. The next prime is 66651119. The reversal of 66651101 is 10115666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66651101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66621101) 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, 8486 + ... + 14328.

It is an arithmetic number, because the mean of its divisors is an integer number (4891428).

Almost surely, 2^66651101 is an apocalyptic number.

66651101 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66651101 is a deficient number, since it is larger than the sum of its proper divisors (11611747).

66651101 is a wasteful number, since it uses less digits than its factorization.

66651101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5932.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 66651101 is about 8164.0125551104. The cubic root of 66651101 is about 405.4485727389.

Adding to 66651101 its reverse (10115666), we get a palindrome (76766767).

The spelling of 66651101 in words is "sixty-six million, six hundred fifty-one thousand, one hundred one".