66698016 has 144 divisors (see below), whose sum is σ = 222354720. Its totient is φ = 17310720.

The previous prime is 66698011. The next prime is 66698017. The reversal of 66698016 is 61089666.

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

It is not an unprimeable number, because it can be changed into a prime (66698011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51100 + ... + 52388.

It is an arithmetic number, because the mean of its divisors is an integer number (1544130).

Almost surely, 2^66698016 is an apocalyptic number.

66698016 is a gapful number since it is divisible by the number (66) 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 66698016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111177360).

66698016 is an abundant number, since it is smaller than the sum of its proper divisors (155656704).

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

66698016 is a wasteful number, since it uses less digits than its factorization.

66698016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327 (or 1312 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 66698016 is about 8166.8853304060. The cubic root of 66698016 is about 405.5436807376.

The spelling of 66698016 in words is "sixty-six million, six hundred ninety-eight thousand, sixteen".