66895770349 has 8 divisors (see below), whose sum is σ = 67598229888. Its totient is φ = 66193572480.

The previous prime is 66895770307. The next prime is 66895770367. The reversal of 66895770349 is 94307759866.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66895770349 - 2¹⁵ = 66895737581 is a prime.

It is a super-2 number, since 2×66895770349² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66895770649) 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, 471564 + ... + 596794.

It is an arithmetic number, because the mean of its divisors is an integer number (8449778736).

Almost surely, 2^66895770349 is an apocalyptic number.

It is an amenable number.

66895770349 is a deficient number, since it is larger than the sum of its proper divisors (702459539).

66895770349 is a wasteful number, since it uses less digits than its factorization.

66895770349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130835.

The product of its (nonzero) digits is 68584320, while the sum is 64.

The spelling of 66895770349 in words is "sixty-six billion, eight hundred ninety-five million, seven hundred seventy thousand, three hundred forty-nine".