66550464 has 112 divisors (see below), whose sum is σ = 206044800. Its totient is φ = 21005568.

The previous prime is 66550441. The next prime is 66550481. The reversal of 66550464 is 46405566.

It is a happy number.

66550464 is a `hidden beast` number, since 66 + 550 + 46 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 31819 + ... + 33845.

Almost surely, 2^66550464 is an apocalyptic number.

66550464 is a gapful number since it is divisible by the number (64) 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 66550464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103022400).

66550464 is an abundant number, since it is smaller than the sum of its proper divisors (139494336).

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

66550464 is a wasteful number, since it uses less digits than its factorization.

66550464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067 (or 2051 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 66550464 is about 8157.8467747317. The cubic root of 66550464 is about 405.2444066613.

The spelling of 66550464 in words is "sixty-six million, five hundred fifty thousand, four hundred sixty-four".