66480681 has 4 divisors (see below), whose sum is σ = 88640912. Its totient is φ = 44320452.

The previous prime is 66480679. The next prime is 66480703. The reversal of 66480681 is 18608466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66480681 - 2¹ = 66480679 is a prime.

It is a super-2 number, since 2×66480681² = 8839361892447522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66480611) 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, 11080111 + ... + 11080116.

It is an arithmetic number, because the mean of its divisors is an integer number (22160228).

Almost surely, 2^66480681 is an apocalyptic number.

It is an amenable number.

66480681 is a deficient number, since it is larger than the sum of its proper divisors (22160231).

66480681 is a wasteful number, since it uses less digits than its factorization.

66480681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22160230.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 66480681 is about 8153.5686052182. The cubic root of 66480681 is about 405.1027143837.

It can be divided in two parts, 66480 and 681, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 66480681 in words is "sixty-six million, four hundred eighty thousand, six hundred eighty-one".