66537408 has 112 divisors (see below), whose sum is σ = 207816704. Its totient is φ = 18385920.

The previous prime is 66537407. The next prime is 66537409. The reversal of 66537408 is 80473566.

It is an interprime number because it is at equal distance from previous prime (66537407) and next prime (66537409).

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66537403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40866 + ... + 42462.

Almost surely, 2^66537408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66537408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103908352).

66537408 is an abundant number, since it is smaller than the sum of its proper divisors (141279296).

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

66537408 is a wasteful number, since it uses less digits than its factorization.

66537408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650 (or 1640 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 66537408 is about 8157.0465243248. The cubic root of 66537408 is about 405.2179043817.

The spelling of 66537408 in words is "sixty-six million, five hundred thirty-seven thousand, four hundred eight".