66808754 has 8 divisors (see below), whose sum is σ = 102921708. Its totient is φ = 32501520.

The previous prime is 66808747. The next prime is 66808757. The reversal of 66808754 is 45780866.

It can be written as a sum of positive squares in 2 ways, for example, as 59706529 + 7102225 = 7727^2 + 2665^2 .

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

It is a super-2 number, since 2×66808754² = 8926819222065032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66808757) 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, 451337 + ... + 451484.

Almost surely, 2^66808754 is an apocalyptic number.

66808754 is a deficient number, since it is larger than the sum of its proper divisors (36112954).

66808754 is a wasteful number, since it uses less digits than its factorization.

66808754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902860.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 66808754 is about 8173.6622146991. The cubic root of 66808754 is about 405.7679965803.

The spelling of 66808754 in words is "sixty-six million, eight hundred eight thousand, seven hundred fifty-four".