66642750 has 96 divisors (see below), whose sum is σ = 187046496. Its totient is φ = 17755200.

The previous prime is 66642731. The next prime is 66642769. The reversal of 66642750 is 5724666.

It is an interprime number because it is at equal distance from previous prime (66642731) and next prime (66642769).

It is a super-2 number, since 2×66642750² = 8882512255125000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60202 + ... + 61298.

It is an arithmetic number, because the mean of its divisors is an integer number (1948401).

Almost surely, 2^66642750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66642750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93523248).

66642750 is an abundant number, since it is smaller than the sum of its proper divisors (120403746).

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

66642750 is a wasteful number, since it uses less digits than its factorization.

66642750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1107 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 66642750 is about 8163.5010871562. The cubic root of 66642750 is about 405.4316385727.

The spelling of 66642750 in words is "sixty-six million, six hundred forty-two thousand, seven hundred fifty".