66151561506 has 8 divisors (see below), whose sum is σ = 132303123024. Its totient is φ = 22050520500.

The previous prime is 66151561453. The next prime is 66151561507. The reversal of 66151561506 is 60516515166.

It is a sphenic number, since it is the product of 3 distinct primes.

66151561506 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66151561507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5512630120 + ... + 5512630131.

It is an arithmetic number, because the mean of its divisors is an integer number (16537890378).

Almost surely, 2^66151561506 is an apocalyptic number.

66151561506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66151561506 is a wasteful number, since it uses less digits than its factorization.

66151561506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11025260256.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 66151561506 in words is "sixty-six billion, one hundred fifty-one million, five hundred sixty-one thousand, five hundred six".