66332640460 has 12 divisors (see below), whose sum is σ = 139298545008. Its totient is φ = 26533056176.

The previous prime is 66332640449. The next prime is 66332640509. The reversal of 66332640460 is 6404623366.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1658315992 + ... + 1658316031.

It is an arithmetic number, because the mean of its divisors is an integer number (11608212084).

Almost surely, 2^66332640460 is an apocalyptic number.

It is an amenable number.

66332640460 is an abundant number, since it is smaller than the sum of its proper divisors (72965904548).

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

66332640460 is a wasteful number, since it uses less digits than its factorization.

66332640460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3316632032 (or 3316632030 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 40.

The spelling of 66332640460 in words is "sixty-six billion, three hundred thirty-two million, six hundred forty thousand, four hundred sixty".