66465750 has 128 divisors (see below), whose sum is σ = 189641088. Its totient is φ = 15360000.

The previous prime is 66465739. The next prime is 66465757. The reversal of 66465750 is 5756466.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 66465699 and 66465708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66465757) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165550 + ... + 165950.

It is an arithmetic number, because the mean of its divisors is an integer number (1481571).

Almost surely, 2^66465750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66465750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94820544).

66465750 is an abundant number, since it is smaller than the sum of its proper divisors (123175338).

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

66465750 is a wasteful number, since it uses less digits than its factorization.

66465750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 66465750 is about 8152.6529424476. The cubic root of 66465750 is about 405.0723845625.

The spelling of 66465750 in words is "sixty-six million, four hundred sixty-five thousand, seven hundred fifty".