66659555400480 has 960 divisors, whose sum is σ = 269817521783040. Its totient is φ = 15182337171456.

The previous prime is 66659555400461. The next prime is 66659555400499. The reversal of 66659555400480 is 8400455595666.

It is an interprime number because it is at equal distance from previous prime (66659555400461) and next prime (66659555400499).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 54238856506 + ... + 54238857734.

It is an arithmetic number, because the mean of its divisors is an integer number (281059918524).

Almost surely, 2^{66659555400480} is an apocalyptic number.

66659555400480 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 66659555400480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134908760891520).

66659555400480 is an abundant number, since it is smaller than the sum of its proper divisors (203157966382560).

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

66659555400480 is a wasteful number, since it uses less digits than its factorization.

66659555400480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903 (or 2886 counting only the distinct ones).

The product of its (nonzero) digits is 155520000, while the sum is 63.

The spelling of 66659555400480 in words is "sixty-six trillion, six hundred fifty-nine billion, five hundred fifty-five million, four hundred thousand, four hundred eighty".