66997026992 has 80 divisors (see below), whose sum is σ = 149448559680. Its totient is φ = 28500885504.

The previous prime is 66997026977. The next prime is 66997027033. The reversal of 66997026992 is 29962079966.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33215168 + ... + 33217184.

It is an arithmetic number, because the mean of its divisors is an integer number (1868106996).

Almost surely, 2^66997026992 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 66997026992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74724279840).

66997026992 is an abundant number, since it is smaller than the sum of its proper divisors (82451532688).

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

66997026992 is a wasteful number, since it uses less digits than its factorization.

66997026992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078 (or 4072 counting only the distinct ones).

The product of its (nonzero) digits is 39680928, while the sum is 65.

The spelling of 66997026992 in words is "sixty-six billion, nine hundred ninety-seven million, twenty-six thousand, nine hundred ninety-two".