66921528996 has 120 divisors (see below), whose sum is σ = 201918674496. Its totient is φ = 18931060800.

The previous prime is 66921528991. The next prime is 66921529033. The reversal of 66921528996 is 69982512966.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (66921528991) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 82995 + ... + 375141.

Almost surely, 2^66921528996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66921528996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100959337248).

66921528996 is an abundant number, since it is smaller than the sum of its proper divisors (134997145500).

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

66921528996 is a wasteful number, since it uses less digits than its factorization.

66921528996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292271 (or 292260 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 63.

The spelling of 66921528996 in words is "sixty-six billion, nine hundred twenty-one million, five hundred twenty-eight thousand, nine hundred ninety-six".