661383 has 12 divisors (see below), whose sum is σ = 978120. Its totient is φ = 430416.

The previous prime is 661373. The next prime is 661393. The reversal of 661383 is 383166.

661383 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661373) and next prime (661393).

It is not a de Polignac number, because 661383 - 2¹⁴ = 644999 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 661383.

It is not an unprimeable number, because it can be changed into a prime (661343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 468 + ... + 1241.

It is an arithmetic number, because the mean of its divisors is an integer number (81510).

2⁶⁶¹³⁸³ is an apocalyptic number.

661383 is a deficient number, since it is larger than the sum of its proper divisors (316737).

661383 is a wasteful number, since it uses less digits than its factorization.

661383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758 (or 1755 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 661383 is about 813.2545726893. The cubic root of 661383 is about 87.1266486792.

The spelling of 661383 in words is "six hundred sixty-one thousand, three hundred eighty-three".