66165505998 has 16 divisors (see below), whose sum is σ = 132335078400. Its totient is φ = 22054490936.

The previous prime is 66165505949. The next prime is 66165505999. The reversal of 66165505998 is 89950556166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66165505999) 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, 67603 + ... + 370001.

It is an arithmetic number, because the mean of its divisors is an integer number (8270942400).

Almost surely, 2^66165505998 is an apocalyptic number.

66165505998 is an abundant number, since it is smaller than the sum of its proper divisors (66169572402).

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

66165505998 is a wasteful number, since it uses less digits than its factorization.

66165505998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338871.

The product of its (nonzero) digits is 17496000, while the sum is 60.

The spelling of 66165505998 in words is "sixty-six billion, one hundred sixty-five million, five hundred five thousand, nine hundred ninety-eight".