661002 has 16 divisors (see below), whose sum is σ = 1354752. Its totient is φ = 214880.

The previous prime is 660983. The next prime is 661009. The reversal of 661002 is 200166.

It is not an unprimeable number, because it can be changed into a prime (661009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1098 + ... + 1589.

It is an arithmetic number, because the mean of its divisors is an integer number (84672).

2⁶⁶¹⁰⁰² is an apocalyptic number.

661002 is an abundant number, since it is smaller than the sum of its proper divisors (693750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661002 is a wasteful number, since it uses less digits than its factorization.

661002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 661002 is about 813.0202949496. The cubic root of 661002 is about 87.1099152436.

Adding to 661002 its reverse (200166), we get a palindrome (861168).

The spelling of 661002 in words is "six hundred sixty-one thousand, two".