66089111001601 has 4 divisors (see below), whose sum is σ = 66095594786052. Its totient is φ = 66082627217152.

The previous prime is 66089111001587. The next prime is 66089111001607. The reversal of 66089111001601 is 10610011198066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50536743566400 + 15552367435201 = 7108920^2 + 3943649^2 .

It is a cyclic number.

It is not a de Polignac number, because 66089111001601 - 2¹⁵ = 66089110968833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66089111001607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3241876936 + ... + 3241897321.

It is an arithmetic number, because the mean of its divisors is an integer number (16523898696513).

Almost surely, 2^{66089111001601} is an apocalyptic number.

It is an amenable number.

66089111001601 is a deficient number, since it is larger than the sum of its proper divisors (6483784451).

66089111001601 is a wasteful number, since it uses less digits than its factorization.

66089111001601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483784450.

The product of its (nonzero) digits is 15552, while the sum is 40.

Adding to 66089111001601 its reverse (10610011198066), we get a palindrome (76699122199667).

The spelling of 66089111001601 in words is "sixty-six trillion, eighty-nine billion, one hundred eleven million, one thousand, six hundred one".