1001016601665 has 32 divisors (see below), whose sum is σ = 1644394663296. Its totient is φ = 519678282240.

The previous prime is 1001016601657. The next prime is 1001016601693. The reversal of 1001016601665 is 5661066101001.

It is not a de Polignac number, because 1001016601665 - 2³ = 1001016601657 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1564654 + ... + 2109543.

It is an arithmetic number, because the mean of its divisors is an integer number (51387333228).

Almost surely, 2^{1001016601665} is an apocalyptic number.

1001016601665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1001016601665 is a deficient number, since it is larger than the sum of its proper divisors (643378061631).

1001016601665 is a wasteful number, since it uses less digits than its factorization.

1001016601665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3674689.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 1001016601665 in words is "one trillion, one billion, sixteen million, six hundred one thousand, six hundred sixty-five".