66153984 has 80 divisors (see below), whose sum is σ = 189852432. Its totient is φ = 20348928.

The previous prime is 66153977. The next prime is 66154001. The reversal of 66153984 is 48935166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18312 + ... + 21624.

Almost surely, 2^66153984 is an apocalyptic number.

66153984 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 66153984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94926216).

66153984 is an abundant number, since it is smaller than the sum of its proper divisors (123698448).

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

66153984 is a wasteful number, since it uses less digits than its factorization.

66153984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347 (or 3331 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 66153984 is about 8133.5099434377. The cubic root of 66153984 is about 404.4380439710.

It can be divided in two parts, 661 and 53984, that added together give a palindrome (54645).

The spelling of 66153984 in words is "sixty-six million, one hundred fifty-three thousand, nine hundred eighty-four".