66595031906 has 32 divisors (see below), whose sum is σ = 115277033088. Its totient is φ = 28579610880.

The previous prime is 66595031897. The next prime is 66595031917. The reversal of 66595031906 is 60913059566.

It is a super-2 number, since 2×66595031906² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 870950 + ... + 944321.

It is an arithmetic number, because the mean of its divisors is an integer number (3602407284).

Almost surely, 2^66595031906 is an apocalyptic number.

66595031906 is a deficient number, since it is larger than the sum of its proper divisors (48682001182).

66595031906 is a wasteful number, since it uses less digits than its factorization.

66595031906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815386.

The product of its (nonzero) digits is 1312200, while the sum is 50.

The spelling of 66595031906 in words is "sixty-six billion, five hundred ninety-five million, thirty-one thousand, nine hundred six".