66915408480 has 192 divisors, whose sum is σ = 216017238528. Its totient is φ = 17406259200.

The previous prime is 66915408479. The next prime is 66915408499. The reversal of 66915408480 is 8480451966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3302380 + ... + 3322580.

It is an arithmetic number, because the mean of its divisors is an integer number (1125089784).

Almost surely, 2^66915408480 is an apocalyptic number.

66915408480 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 66915408480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108008619264).

66915408480 is an abundant number, since it is smaller than the sum of its proper divisors (149101830048).

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

66915408480 is a wasteful number, since it uses less digits than its factorization.

66915408480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20389 (or 20381 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 66915408480 in words is "sixty-six billion, nine hundred fifteen million, four hundred eight thousand, four hundred eighty".