67201665 has 32 divisors (see below), whose sum is σ = 111234816. Its totient is φ = 34621440.

The previous prime is 67201639. The next prime is 67201679. The reversal of 67201665 is 56610276.

It is not a de Polignac number, because 67201665 - 2⁵ = 67201633 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69012 + ... + 69978.

It is an arithmetic number, because the mean of its divisors is an integer number (3476088).

Almost surely, 2^67201665 is an apocalyptic number.

It is an amenable number.

67201665 is a deficient number, since it is larger than the sum of its proper divisors (44033151).

67201665 is a wasteful number, since it uses less digits than its factorization.

67201665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 67201665 is about 8197.6621667400. The cubic root of 67201665 is about 406.5619004362.

It can be divided in two parts, 6720 and 1665, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 67201665 in words is "sixty-seven million, two hundred one thousand, six hundred sixty-five".