66044360690 has 32 divisors (see below), whose sum is σ = 148213839744. Its totient is φ = 20585255040.

The previous prime is 66044360671. The next prime is 66044360699. The reversal of 66044360690 is 9606344066.

It is a super-2 number, since 2×66044360690² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66044360699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42885179 + ... + 42886718.

It is an arithmetic number, because the mean of its divisors is an integer number (4631682492).

Almost surely, 2^66044360690 is an apocalyptic number.

66044360690 is an abundant number, since it is smaller than the sum of its proper divisors (82169479054).

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

66044360690 is a wasteful number, since it uses less digits than its factorization.

66044360690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85771922.

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

The spelling of 66044360690 in words is "sixty-six billion, forty-four million, three hundred sixty thousand, six hundred ninety".