66897016320 has 320 divisors, whose sum is σ = 217899196416. Its totient is φ = 17505976320.

The previous prime is 66897016313. The next prime is 66897016327. The reversal of 66897016320 is 2361079866.

It is an interprime number because it is at equal distance from previous prime (66897016313) and next prime (66897016327).

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 66897016320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66897016327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104363200 + ... + 104363840.

Almost surely, 2^66897016320 is an apocalyptic number.

66897016320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66897016320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108949598208).

66897016320 is an abundant number, since it is smaller than the sum of its proper divisors (151002180096).

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

66897016320 is a wasteful number, since it uses less digits than its factorization.

66897016320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 885 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 66897016320 in words is "sixty-six billion, eight hundred ninety-seven million, sixteen thousand, three hundred twenty".