66786081 has 8 divisors (see below), whose sum is σ = 94286304. Its totient is φ = 41904960.

The previous prime is 66786067. The next prime is 66786091. The reversal of 66786081 is 18068766.

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

It is not a de Polignac number, because 66786081 - 2⁶ = 66786017 is a prime.

It is a super-2 number, since 2×66786081² = 8920761230677122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66786061) 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, 654715 + ... + 654816.

It is an arithmetic number, because the mean of its divisors is an integer number (11785788).

Almost surely, 2^66786081 is an apocalyptic number.

It is an amenable number.

66786081 is a deficient number, since it is larger than the sum of its proper divisors (27500223).

66786081 is a wasteful number, since it uses less digits than its factorization.

66786081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309551.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 66786081 is about 8172.2751422110. The cubic root of 66786081 is about 405.7220893293.

The spelling of 66786081 in words is "sixty-six million, seven hundred eighty-six thousand, eighty-one".