61668533 has 8 divisors (see below), whose sum is σ = 62333952. Its totient is φ = 61006176.

The previous prime is 61668527. The next prime is 61668539. The reversal of 61668533 is 33586616.

It is an interprime number because it is at equal distance from previous prime (61668527) and next prime (61668539).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61668533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61668539) 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 7 ways as a sum of consecutive naturals, for example, 77966 + ... + 78752.

It is an arithmetic number, because the mean of its divisors is an integer number (7791744).

Almost surely, 2^61668533 is an apocalyptic number.

It is an amenable number.

61668533 is a deficient number, since it is larger than the sum of its proper divisors (665419).

61668533 is a wasteful number, since it uses less digits than its factorization.

61668533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531.

The product of its digits is 77760, while the sum is 38.

The square root of 61668533 is about 7852.9314908510. The cubic root of 61668533 is about 395.0825720663.

The spelling of 61668533 in words is "sixty-one million, six hundred sixty-eight thousand, five hundred thirty-three".