66440691332 has 6 divisors (see below), whose sum is σ = 116271209838. Its totient is φ = 33220345664.

The previous prime is 66440691301. The next prime is 66440691341. The reversal of 66440691332 is 23319604466.

It can be written as a sum of positive squares in only one way, i.e., 41638851136 + 24801840196 = 204056^2 + 157486^2 .

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 as a sum of consecutive naturals, namely, 8305086413 + ... + 8305086420.

It is an arithmetic number, because the mean of its divisors is an integer number (19378534973).

Almost surely, 2^66440691332 is an apocalyptic number.

It is an amenable number.

66440691332 is a deficient number, since it is larger than the sum of its proper divisors (49830518506).

66440691332 is a wasteful number, since it uses less digits than its factorization.

66440691332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16610172837 (or 16610172835 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 66440691332 in words is "sixty-six billion, four hundred forty million, six hundred ninety-one thousand, three hundred thirty-two".