66149824 has 56 divisors (see below), whose sum is σ = 144729200. Its totient is φ = 29820672.

The previous prime is 66149819. The next prime is 66149827. The reversal of 66149824 is 42894166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66149827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1538347 + ... + 1538389.

It is an arithmetic number, because the mean of its divisors is an integer number (2584450).

Almost surely, 2^66149824 is an apocalyptic number.

66149824 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 66149824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72364600).

66149824 is an abundant number, since it is smaller than the sum of its proper divisors (78579376).

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

66149824 is an frugal number, since it uses more digits than its factorization.

66149824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 58 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 66149824 is about 8133.2542072654. The cubic root of 66149824 is about 404.4295662880.

The spelling of 66149824 in words is "sixty-six million, one hundred forty-nine thousand, eight hundred twenty-four".