66680920 has 32 divisors (see below), whose sum is σ = 150804000. Its totient is φ = 26535168.

The previous prime is 66680909. The next prime is 66680951. The reversal of 66680920 is 2908666.

It is a self number, because there is not a number n which added to its sum of digits gives 66680920.

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, 3772 + ... + 12148.

It is an arithmetic number, because the mean of its divisors is an integer number (4712625).

Almost surely, 2^66680920 is an apocalyptic number.

It is an amenable number.

66680920 is an abundant number, since it is smaller than the sum of its proper divisors (84123080).

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

66680920 is a wasteful number, since it uses less digits than its factorization.

66680920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8587 (or 8583 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 66680920 is about 8165.8385974742. The cubic root of 66680920 is about 405.5090281965.

It can be divided in two parts, 66680 and 920, that added together give a square (67600 = 260²).

The spelling of 66680920 in words is "sixty-six million, six hundred eighty thousand, nine hundred twenty".