66147306820 has 48 divisors (see below), whose sum is σ = 158797675008. Its totient is φ = 22672771200.

The previous prime is 66147306769. The next prime is 66147306847. The reversal of 66147306820 is 2860374166.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454309 + ... + 581971.

It is an arithmetic number, because the mean of its divisors is an integer number (3308284896).

Almost surely, 2^66147306820 is an apocalyptic number.

It is an amenable number.

66147306820 is an abundant number, since it is smaller than the sum of its proper divisors (92650368188).

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

66147306820 is a wasteful number, since it uses less digits than its factorization.

66147306820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131380 (or 131378 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 66147306820 in words is "sixty-six billion, one hundred forty-seven million, three hundred six thousand, eight hundred twenty".