66051881 has 8 divisors (see below), whose sum is σ = 75868800. Its totient is φ = 56330208.

The previous prime is 66051877. The next prime is 66051889. The reversal of 66051881 is 18815066.

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

It is a cyclic number.

It is not a de Polignac number, because 66051881 - 2² = 66051877 is a prime.

It is a super-2 number, since 2×66051881² = 8725701967276322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66051889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22316 + ... + 25101.

It is an arithmetic number, because the mean of its divisors is an integer number (9483600).

Almost surely, 2^66051881 is an apocalyptic number.

It is an amenable number.

66051881 is a deficient number, since it is larger than the sum of its proper divisors (9816919).

66051881 is a wasteful number, since it uses less digits than its factorization.

66051881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47623.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 66051881 is about 8127.2308322085. The cubic root of 66051881 is about 404.2298650220.

The spelling of 66051881 in words is "sixty-six million, fifty-one thousand, eight hundred eighty-one".