66655855607 has 8 divisors (see below), whose sum is σ = 74680762512. Its totient is φ = 58958496000.

The previous prime is 66655855561. The next prime is 66655855627. The reversal of 66655855607 is 70655855666.

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 66655855607 - 2¹⁰ = 66655854583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66655855627) 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, 81886394 + ... + 81887207.

It is an arithmetic number, because the mean of its divisors is an integer number (9335095314).

Almost surely, 2^66655855607 is an apocalyptic number.

66655855607 is a deficient number, since it is larger than the sum of its proper divisors (8024906905).

66655855607 is a wasteful number, since it uses less digits than its factorization.

66655855607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163773649.

The product of its (nonzero) digits is 45360000, while the sum is 59.

Adding to 66655855607 its sum of digits (59), we get a palindrome (66655855666).

The spelling of 66655855607 in words is "sixty-six billion, six hundred fifty-five million, eight hundred fifty-five thousand, six hundred seven".