1665601601115 has 8 divisors (see below), whose sum is σ = 2664962561808. Its totient is φ = 888320853920.

The previous prime is 1665601601077. The next prime is 1665601601123. The reversal of 1665601601115 is 5111061065661.

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

It is not a de Polignac number, because 1665601601115 - 2¹⁵ = 1665601568347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55520053356 + ... + 55520053385.

It is an arithmetic number, because the mean of its divisors is an integer number (333120320226).

Almost surely, 2^{1665601601115} is an apocalyptic number.

1665601601115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1665601601115 is a deficient number, since it is larger than the sum of its proper divisors (999360960693).

1665601601115 is a wasteful number, since it uses less digits than its factorization.

1665601601115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111040106749.

The product of its (nonzero) digits is 32400, while the sum is 39.

Adding to 1665601601115 its reverse (5111061065661), we get a palindrome (6776662666776).

The spelling of 1665601601115 in words is "one trillion, six hundred sixty-five billion, six hundred one million, six hundred one thousand, one hundred fifteen".