66222020196878 has 64 divisors (see below), whose sum is σ = 122631946738560. Its totient is φ = 26117206106112.

The previous prime is 66222020196877. The next prime is 66222020196881. The reversal of 66222020196878 is 87869102022266.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66222020196877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 270803168 + ... + 271047596.

It is an arithmetic number, because the mean of its divisors is an integer number (1916124167790).

Almost surely, 2^{66222020196878} is an apocalyptic number.

66222020196878 is a deficient number, since it is larger than the sum of its proper divisors (56409926541682).

66222020196878 is a wasteful number, since it uses less digits than its factorization.

66222020196878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249021.

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 66222020196878 in words is "sixty-six trillion, two hundred twenty-two billion, twenty million, one hundred ninety-six thousand, eight hundred seventy-eight".