66965521013 has 8 divisors (see below), whose sum is σ = 69278976000. Its totient is φ = 64652352688.

The previous prime is 66965521001. The next prime is 66965521043. The reversal of 66965521013 is 31012556966.

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

It is not a de Polignac number, because 66965521013 - 2⁸ = 66965520757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66965521043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474188 + ... + 598986.

It is an arithmetic number, because the mean of its divisors is an integer number (8659872000).

Almost surely, 2^66965521013 is an apocalyptic number.

It is an amenable number.

66965521013 is a deficient number, since it is larger than the sum of its proper divisors (2313454987).

66965521013 is a wasteful number, since it uses less digits than its factorization.

66965521013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143331.

The product of its (nonzero) digits is 291600, while the sum is 44.

The spelling of 66965521013 in words is "sixty-six billion, nine hundred sixty-five million, five hundred twenty-one thousand, thirteen".