661613283 has 6 divisors (see below), whose sum is σ = 955663644. Its totient is φ = 441075516.

The previous prime is 661613261. The next prime is 661613299. The reversal of 661613283 is 382316166.

661613283 is a `hidden beast` number, since 6 + 616 + 1 + 32 + 8 + 3 = 666.

It is not a de Polignac number, because 661613283 - 2²¹ = 659516131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661613083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36756285 + ... + 36756302.

It is an arithmetic number, because the mean of its divisors is an integer number (159277274).

Almost surely, 2^661613283 is an apocalyptic number.

661613283 is a deficient number, since it is larger than the sum of its proper divisors (294050361).

661613283 is a wasteful number, since it uses less digits than its factorization.

661613283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73512593 (or 73512590 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 661613283 is about 25721.8444711883. The cubic root of 661613283 is about 871.3675954174.

The spelling of 661613283 in words is "six hundred sixty-one million, six hundred thirteen thousand, two hundred eighty-three".