61855918 has 8 divisors (see below), whose sum is σ = 92839320. Its totient is φ = 30909480.

The previous prime is 61855909. The next prime is 61855919. The reversal of 61855918 is 81955816.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61855919) 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 3 ways as a sum of consecutive naturals, for example, 4588 + ... + 12031.

It is an arithmetic number, because the mean of its divisors is an integer number (11604915).

Almost surely, 2^61855918 is an apocalyptic number.

61855918 is a deficient number, since it is larger than the sum of its proper divisors (30983402).

61855918 is a wasteful number, since it uses less digits than its factorization.

61855918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18482.

The product of its digits is 86400, while the sum is 43.

The square root of 61855918 is about 7864.8533362041. The cubic root of 61855918 is about 395.4823312617.

The spelling of 61855918 in words is "sixty-one million, eight hundred fifty-five thousand, nine hundred eighteen".