661367 has 8 divisors (see below), whose sum is σ = 763776. Its totient is φ = 560952.

The previous prime is 661361. The next prime is 661373. The reversal of 661367 is 763166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (661361) and next prime (661373).

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

It is a de Polignac number, because none of the positive numbers 2^k-661367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 661367.

It is not an unprimeable number, because it can be changed into a prime (661361) 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, 308 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (95472).

2⁶⁶¹³⁶⁷ is an apocalyptic number.

661367 is a deficient number, since it is larger than the sum of its proper divisors (102409).

661367 is a wasteful number, since it uses less digits than its factorization.

661367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997.

The product of its digits is 4536, while the sum is 29.

The square root of 661367 is about 813.2447356116. The cubic root of 661367 is about 87.1259460920.

The spelling of 661367 in words is "six hundred sixty-one thousand, three hundred sixty-seven".