66554880 has 176 divisors, whose sum is σ = 243674880. Its totient is φ = 15187968.

The previous prime is 66554879. The next prime is 66554921. The reversal of 66554880 is 8845566.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107211 + ... + 107829.

Almost surely, 2^66554880 is an apocalyptic number.

66554880 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 66554880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121837440).

66554880 is an abundant number, since it is smaller than the sum of its proper divisors (177120000).

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

66554880 is a wasteful number, since it uses less digits than its factorization.

66554880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 66554880 is about 8158.1174298977. The cubic root of 66554880 is about 405.2533698831.

The spelling of 66554880 in words is "sixty-six million, five hundred fifty-four thousand, eight hundred eighty".