66650040 has 96 divisors (see below), whose sum is σ = 224668080. Its totient is φ = 17770752.

The previous prime is 66650029. The next prime is 66650057. The reversal of 66650040 is 4005666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 66649986 and 66650013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6292 + ... + 13148.

Almost surely, 2^66650040 is an apocalyptic number.

66650040 is a gapful number since it is divisible by the number (60) 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 66650040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112334040).

66650040 is an abundant number, since it is smaller than the sum of its proper divisors (158018040).

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

66650040 is a wasteful number, since it uses less digits than its factorization.

66650040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6883 (or 6867 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 66650040 is about 8163.9475745499. The cubic root of 66650040 is about 405.4464213204.

The spelling of 66650040 in words is "sixty-six million, six hundred fifty thousand, forty".