66650136 has 128 divisors (see below), whose sum is σ = 203489280. Its totient is φ = 17778816.

The previous prime is 66650069. The next prime is 66650137. The reversal of 66650136 is 63105666.

It is a junction number, because it is equal to n+sod(n) for n = 66650097 and 66650106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66650137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181425 + ... + 181791.

It is an arithmetic number, because the mean of its divisors is an integer number (1589760).

Almost surely, 2^66650136 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 66650136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101744640).

66650136 is an abundant number, since it is smaller than the sum of its proper divisors (136839144).

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

66650136 is a wasteful number, since it uses less digits than its factorization.

66650136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 66650136 is about 8163.9534540564. The cubic root of 66650136 is about 405.4466159832.

The spelling of 66650136 in words is "sixty-six million, six hundred fifty thousand, one hundred thirty-six".