66480621 has 8 divisors (see below), whose sum is σ = 88680864. Its totient is φ = 44300400.

The previous prime is 66480611. The next prime is 66480641. The reversal of 66480621 is 12608466.

It is a happy number.

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

It is not a de Polignac number, because 66480621 - 2⁷ = 66480493 is a prime.

It is a Curzon number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 6571 + ... + 13271.

It is an arithmetic number, because the mean of its divisors is an integer number (11085108).

Almost surely, 2^66480621 is an apocalyptic number.

It is an amenable number.

66480621 is a deficient number, since it is larger than the sum of its proper divisors (22200243).

66480621 is a wasteful number, since it uses less digits than its factorization.

66480621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10011.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 66480621 is about 8153.5649258469. The cubic root of 66480621 is about 405.1025925129.

The spelling of 66480621 in words is "sixty-six million, four hundred eighty thousand, six hundred twenty-one".