66551010111 has 12 divisors (see below), whose sum is σ = 96148654992. Its totient is φ = 44358377856.

The previous prime is 66551010109. The next prime is 66551010131. The reversal of 66551010111 is 11101015566.

66551010111 is a `hidden beast` number, since 6 + 6 + 551 + 0 + 101 + 1 + 1 = 666.

It is not a de Polignac number, because 66551010111 - 2¹ = 66551010109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66551010131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 699666 + ... + 789071.

It is an arithmetic number, because the mean of its divisors is an integer number (8012387916).

Almost surely, 2^66551010111 is an apocalyptic number.

66551010111 is a deficient number, since it is larger than the sum of its proper divisors (29597644881).

66551010111 is a wasteful number, since it uses less digits than its factorization.

66551010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493710 (or 1493707 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

Adding to 66551010111 its reverse (11101015566), we get a palindrome (77652025677).

The spelling of 66551010111 in words is "sixty-six billion, five hundred fifty-one million, ten thousand, one hundred eleven".