61668851 has 4 divisors (see below), whose sum is σ = 64914600. Its totient is φ = 58423104.

The previous prime is 61668833. The next prime is 61668857. The reversal of 61668851 is 15886616.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61668851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61668799 and 61668808.

It is not an unprimeable number, because it can be changed into a prime (61668857) 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 3 ways as a sum of consecutive naturals, for example, 1622846 + ... + 1622883.

It is an arithmetic number, because the mean of its divisors is an integer number (16228650).

Almost surely, 2^61668851 is an apocalyptic number.

61668851 is a deficient number, since it is larger than the sum of its proper divisors (3245749).

61668851 is a wasteful number, since it uses less digits than its factorization.

61668851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245748.

The product of its digits is 69120, while the sum is 41.

The square root of 61668851 is about 7852.9517380409. The cubic root of 61668851 is about 395.0832511595.

The spelling of 61668851 in words is "sixty-one million, six hundred sixty-eight thousand, eight hundred fifty-one".