661299 has 8 divisors (see below), whose sum is σ = 888720. Its totient is φ = 437376.

The previous prime is 661267. The next prime is 661321. The reversal of 661299 is 992166.

It is a happy number.

661299 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 661299 - 2⁵ = 661267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661259) 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, 394 + ... + 1215.

It is an arithmetic number, because the mean of its divisors is an integer number (111090).

2⁶⁶¹²⁹⁹ is an apocalyptic number.

661299 is a deficient number, since it is larger than the sum of its proper divisors (227421).

661299 is a wasteful number, since it uses less digits than its factorization.

661299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749.

The product of its digits is 5832, while the sum is 33.

The square root of 661299 is about 813.2029267040. The cubic root of 661299 is about 87.1229599701.

The spelling of 661299 in words is "six hundred sixty-one thousand, two hundred ninety-nine".