66707550 has 240 divisors, whose sum is σ = 229381152. Its totient is φ = 13996800.

The previous prime is 66707539. The next prime is 66707561. The reversal of 66707550 is 5570766.

It is an interprime number because it is at equal distance from previous prime (66707539) and next prime (66707561).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 368460 + ... + 368640.

Almost surely, 2^66707550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66707550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114690576).

66707550 is an abundant number, since it is smaller than the sum of its proper divisors (162673602).

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

66707550 is a wasteful number, since it uses less digits than its factorization.

66707550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 66707550 is about 8167.4690082057. The cubic root of 66707550 is about 405.5630029977.

The spelling of 66707550 in words is "sixty-six million, seven hundred seven thousand, five hundred fifty".