66522620 has 24 divisors (see below), whose sum is σ = 140708400. Its totient is φ = 26416512.

The previous prime is 66522619. The next prime is 66522713. The reversal of 66522620 is 2622566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9185 + ... + 14744.

It is an arithmetic number, because the mean of its divisors is an integer number (5862850).

Almost surely, 2^66522620 is an apocalyptic number.

It is an amenable number.

66522620 is an abundant number, since it is smaller than the sum of its proper divisors (74185780).

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

66522620 is a wasteful number, since it uses less digits than its factorization.

66522620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24077 (or 24075 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66522620 is about 8156.1400184156. The cubic root of 66522620 is about 405.1878821404.

The spelling of 66522620 in words is "sixty-six million, five hundred twenty-two thousand, six hundred twenty".