66210384928 has 24 divisors (see below), whose sum is σ = 130523033340. Its totient is φ = 33061678080.

The previous prime is 66210384907. The next prime is 66210384937. The reversal of 66210384928 is 82948301266.

It can be written as a sum of positive squares in 2 ways, for example, as 63659326864 + 2551058064 = 252308^2 + 50508^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1335093 + ... + 1383796.

Almost surely, 2^66210384928 is an apocalyptic number.

It is an amenable number.

66210384928 is a deficient number, since it is larger than the sum of its proper divisors (64312648412).

66210384928 is a wasteful number, since it uses less digits than its factorization.

66210384928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719660 (or 2719652 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 66210384928 in words is "sixty-six billion, two hundred ten million, three hundred eighty-four thousand, nine hundred twenty-eight".