66755380 has 24 divisors (see below), whose sum is σ = 143607240. Its totient is φ = 26050560.

The previous prime is 66755357. The next prime is 66755387. The reversal of 66755380 is 8355766.

66755380 = T₁₇₈₄ + T₁₇₈₅ + ... + T₁₈₂₄.

It can be written as a sum of positive squares in 4 ways, for example, as 71824 + 66683556 = 268^2 + 8166^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66755387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39885 + ... + 41524.

It is an arithmetic number, because the mean of its divisors is an integer number (5983635).

Almost surely, 2^66755380 is an apocalyptic number.

It is an amenable number.

66755380 is an abundant number, since it is smaller than the sum of its proper divisors (76851860).

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

66755380 is a wasteful number, since it uses less digits than its factorization.

66755380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81459 (or 81457 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 66755380 is about 8170.3965632030. The cubic root of 66755380 is about 405.6599107894.

The spelling of 66755380 in words is "sixty-six million, seven hundred fifty-five thousand, three hundred eighty".