66511621000 has 64 divisors (see below), whose sum is σ = 169786056960. Its totient is φ = 24186040000.

The previous prime is 66511620971. The next prime is 66511621003. The reversal of 66511621000 is 12611566.

It is a self number, because there is not a number n which added to its sum of digits gives 66511621000.

It is not an unprimeable number, because it can be changed into a prime (66511621003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3012256 + ... + 3034255.

It is an arithmetic number, because the mean of its divisors is an integer number (2652907140).

Almost surely, 2^66511621000 is an apocalyptic number.

It is an amenable number.

66511621000 is an abundant number, since it is smaller than the sum of its proper divisors (103274435960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66511621000 is a wasteful number, since it uses less digits than its factorization.

66511621000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6046543 (or 6046529 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 66511621000 in words is "sixty-six billion, five hundred eleven million, six hundred twenty-one thousand".