66220870 has 16 divisors (see below), whose sum is σ = 119290320. Its totient is φ = 26467744.

The previous prime is 66220849. The next prime is 66220877. The reversal of 66220870 is 7802266.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66220877) 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, 23244 + ... + 25936.

It is an arithmetic number, because the mean of its divisors is an integer number (7455645).

Almost surely, 2^66220870 is an apocalyptic number.

66220870 is a deficient number, since it is larger than the sum of its proper divisors (53069450).

66220870 is a wasteful number, since it uses less digits than its factorization.

66220870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 66220870 is about 8137.6206596277. The cubic root of 66220870 is about 404.5743024881.

The spelling of 66220870 in words is "sixty-six million, two hundred twenty thousand, eight hundred seventy".