66580464621 has 32 divisors (see below), whose sum is σ = 98369354880. Its totient is φ = 39720992000.

The previous prime is 66580464569. The next prime is 66580464667. The reversal of 66580464621 is 12646408566.

It is a cyclic number.

It is not a de Polignac number, because 66580464621 - 2⁶ = 66580464557 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 (66580462621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 518875 + ... + 634343.

It is an arithmetic number, because the mean of its divisors is an integer number (3074042340).

Almost surely, 2^66580464621 is an apocalyptic number.

It is an amenable number.

66580464621 is a deficient number, since it is larger than the sum of its proper divisors (31788890259).

66580464621 is a wasteful number, since it uses less digits than its factorization.

66580464621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115757.

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 66580464621 in words is "sixty-six billion, five hundred eighty million, four hundred sixty-four thousand, six hundred twenty-one".