66220157946 has 32 divisors (see below), whose sum is σ = 139192865280. Its totient is φ = 20961770544.

The previous prime is 66220157903. The next prime is 66220157947. The reversal of 66220157946 is 64975102266.

It is a junction number, because it is equal to n+sod(n) for n = 66220157895 and 66220157904.

It is not an unprimeable number, because it can be changed into a prime (66220157947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1706920 + ... + 1745283.

It is an arithmetic number, because the mean of its divisors is an integer number (4349777040).

Almost surely, 2^66220157946 is an apocalyptic number.

66220157946 is an abundant number, since it is smaller than the sum of its proper divisors (72972707334).

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

66220157946 is a wasteful number, since it uses less digits than its factorization.

66220157946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3452370.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 66220157946 in words is "sixty-six billion, two hundred twenty million, one hundred fifty-seven thousand, nine hundred forty-six".