66655530 has 48 divisors (see below), whose sum is σ = 173871360. Its totient is φ = 17716704.

The previous prime is 66655513. The next prime is 66655573. The reversal of 66655530 is 3555666.

66655530 = T₄₂₁ + T₄₂₂ + ... + T₇₇₉.

It is a happy number.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31279 + ... + 33341.

It is an arithmetic number, because the mean of its divisors is an integer number (3622320).

Almost surely, 2^66655530 is an apocalyptic number.

66655530 is an abundant number, since it is smaller than the sum of its proper divisors (107215830).

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

66655530 is a wasteful number, since it uses less digits than its factorization.

66655530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435 (or 2432 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 66655530 is about 8164.2838020245. The cubic root of 66655530 is about 405.4575532955.

The spelling of 66655530 in words is "sixty-six million, six hundred fifty-five thousand, five hundred thirty".