66919371960 has 256 divisors, whose sum is σ = 231413760000. Its totient is φ = 15164711424.

The previous prime is 66919371929. The next prime is 66919371997. The reversal of 66919371960 is 6917391966.

66919371960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66919371960.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 93072481 + ... + 93073199.

It is an arithmetic number, because the mean of its divisors is an integer number (903960000).

Almost surely, 2^66919371960 is an apocalyptic number.

66919371960 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 66919371960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115706880000).

66919371960 is an abundant number, since it is smaller than the sum of its proper divisors (164494388040).

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

66919371960 is a wasteful number, since it uses less digits than its factorization.

66919371960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538 (or 1534 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 57.

It can be divided in two parts, 669193 and 71960, that added together give a triangular number (741153 = T₁₂₁₇).

The spelling of 66919371960 in words is "sixty-six billion, nine hundred nineteen million, three hundred seventy-one thousand, nine hundred sixty".