61661116 has 18 divisors (see below), whose sum is σ = 118609400. Its totient is φ = 28027560.

The previous prime is 61661113. The next prime is 61661123. The reversal of 61661116 is 61116616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61661111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63216 + ... + 64183.

Almost surely, 2^61661116 is an apocalyptic number.

It is an amenable number.

61661116 is a deficient number, since it is larger than the sum of its proper divisors (56948284).

61661116 is a wasteful number, since it uses less digits than its factorization.

61661116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127425 (or 127412 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 61661116 is about 7852.4592326226. The cubic root of 61661116 is about 395.0667323029.

The spelling of 61661116 in words is "sixty-one million, six hundred sixty-one thousand, one hundred sixteen".