661007 has 4 divisors (see below), whose sum is σ = 663336. Its totient is φ = 658680.

The previous prime is 660983. The next prime is 661009. The reversal of 661007 is 700166.

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

It is a cyclic number.

It is not a de Polignac number, because 661007 - 2¹⁰ = 659983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661009) 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, 668 + ... + 1329.

It is an arithmetic number, because the mean of its divisors is an integer number (165834).

2⁶⁶¹⁰⁰⁷ is an apocalyptic number.

661007 is a deficient number, since it is larger than the sum of its proper divisors (2329).

661007 is a wasteful number, since it uses less digits than its factorization.

661007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 661007 is about 813.0233698978. The cubic root of 661007 is about 87.1101348841.

The spelling of 661007 in words is "six hundred sixty-one thousand, seven".