61668293 has 4 divisors (see below), whose sum is σ = 61811148. Its totient is φ = 61525440.

The previous prime is 61668287. The next prime is 61668301. The reversal of 61668293 is 39286616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23203489 + 38464804 = 4817^2 + 6202^2 .

It is a cyclic number.

It is not a de Polignac number, because 61668293 - 2²² = 57473989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61668293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61668193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70778 + ... + 71643.

It is an arithmetic number, because the mean of its divisors is an integer number (15452787).

Almost surely, 2^61668293 is an apocalyptic number.

It is an amenable number.

61668293 is a deficient number, since it is larger than the sum of its proper divisors (142855).

61668293 is a wasteful number, since it uses less digits than its factorization.

61668293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142854.

The product of its digits is 93312, while the sum is 41.

The square root of 61668293 is about 7852.9162099185. The cubic root of 61668293 is about 395.0820595416.

The spelling of 61668293 in words is "sixty-one million, six hundred sixty-eight thousand, two hundred ninety-three".