661067 has 8 divisors (see below), whose sum is σ = 759360. Its totient is φ = 569160.

The previous prime is 661061. The next prime is 661091. The reversal of 661067 is 760166.

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

It is a cyclic number.

It is not a de Polignac number, because 661067 - 2⁸ = 660811 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (661061) 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, 1373 + ... + 1790.

It is an arithmetic number, because the mean of its divisors is an integer number (94920).

2⁶⁶¹⁰⁶⁷ is an apocalyptic number.

661067 is a deficient number, since it is larger than the sum of its proper divisors (98293).

661067 is a wasteful number, since it uses less digits than its factorization.

661067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3193.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 661067 is about 813.0602683688. The cubic root of 661067 is about 87.1127704841.

Subtracting 661067 from its reverse (760166), we obtain a palindrome (99099).

The spelling of 661067 in words is "six hundred sixty-one thousand, sixty-seven".