66870299664 has 240 divisors, whose sum is σ = 230374144000. Its totient is φ = 17679078144.

The previous prime is 66870299633. The next prime is 66870299669. The reversal of 66870299664 is 46699207866.

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 (66870299669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 782937 + ... + 864135.

Almost surely, 2^66870299664 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 66870299664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115187072000).

66870299664 is an abundant number, since it is smaller than the sum of its proper divisors (163503844336).

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

66870299664 is a wasteful number, since it uses less digits than its factorization.

66870299664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81282 (or 81273 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 63.

The spelling of 66870299664 in words is "sixty-six billion, eight hundred seventy million, two hundred ninety-nine thousand, six hundred sixty-four".