66545388000 has 1920 divisors, whose sum is σ = 313793415936. Its totient is φ = 13436928000.

The previous prime is 66545387999. The next prime is 66545388011. The reversal of 66545388000 is 88354566.

66545388000 is a `hidden beast` number, since 66 + 54 + 538 + 8 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 319 ways as a sum of consecutive naturals, for example, 1090907970 + ... + 1090908030.

Almost surely, 2^66545388000 is an apocalyptic number.

66545388000 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 66545388000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156896707968).

66545388000 is an abundant number, since it is smaller than the sum of its proper divisors (247248027936).

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

66545388000 is a wasteful number, since it uses less digits than its factorization.

66545388000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 66545388000 in words is "sixty-six billion, five hundred forty-five million, three hundred eighty-eight thousand".