66106232551 has 4 divisors (see below), whose sum is σ = 66111926832. Its totient is φ = 66100538272.

The previous prime is 66106232537. The next prime is 66106232557. The reversal of 66106232551 is 15523260166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15523260166 = 2 ⋅7761630083.

It is a cyclic number.

It is not a de Polignac number, because 66106232551 - 2¹¹ = 66106230503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66106232551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66106232557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2829691 + ... + 2852956.

It is an arithmetic number, because the mean of its divisors is an integer number (16527981708).

Almost surely, 2^66106232551 is an apocalyptic number.

66106232551 is a deficient number, since it is larger than the sum of its proper divisors (5694281).

66106232551 is a wasteful number, since it uses less digits than its factorization.

66106232551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694280.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 66106232551 in words is "sixty-six billion, one hundred six million, two hundred thirty-two thousand, five hundred fifty-one".