61668475 has 24 divisors (see below), whose sum is σ = 84691008. Its totient is φ = 44167200.

The previous prime is 61668473. The next prime is 61668527. The reversal of 61668475 is 57486616.

It is a happy number.

It is not a de Polignac number, because 61668475 - 2¹ = 61668473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61668473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16752 + ... + 20098.

It is an arithmetic number, because the mean of its divisors is an integer number (3528792).

Almost surely, 2^61668475 is an apocalyptic number.

61668475 is a deficient number, since it is larger than the sum of its proper divisors (23022533).

61668475 is a wasteful number, since it uses less digits than its factorization.

61668475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3435 (or 3430 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 61668475 is about 7852.9277979617. The cubic root of 61668475 is about 395.0824482063.

It can be divided in two parts, 6166 and 8475, that added together give a palindrome (14641).

The spelling of 61668475 in words is "sixty-one million, six hundred sixty-eight thousand, four hundred seventy-five".