61668871 has 4 divisors (see below), whose sum is σ = 67275144. Its totient is φ = 56062600.

The previous prime is 61668869. The next prime is 61668907. The reversal of 61668871 is 17886616.

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

It is not a de Polignac number, because 61668871 - 2¹ = 61668869 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 (61668071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2803120 + ... + 2803141.

It is an arithmetic number, because the mean of its divisors is an integer number (16818786).

Almost surely, 2^61668871 is an apocalyptic number.

61668871 is a deficient number, since it is larger than the sum of its proper divisors (5606273).

61668871 is a wasteful number, since it uses less digits than its factorization.

61668871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5606272.

The product of its digits is 96768, while the sum is 43.

The square root of 61668871 is about 7852.9530114473. The cubic root of 61668871 is about 395.0832938697.

The spelling of 61668871 in words is "sixty-one million, six hundred sixty-eight thousand, eight hundred seventy-one".