61718118 has 128 divisors (see below), whose sum is σ = 165888000. Its totient is φ = 14826240.

The previous prime is 61718101. The next prime is 61718123. The reversal of 61718118 is 81181716.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 693418 + ... + 693506.

It is an arithmetic number, because the mean of its divisors is an integer number (1296000).

Almost surely, 2^61718118 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61718118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82944000).

61718118 is an abundant number, since it is smaller than the sum of its proper divisors (104169882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61718118 is a wasteful number, since it uses less digits than its factorization.

61718118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210.

The product of its digits is 2688, while the sum is 33.

The square root of 61718118 is about 7856.0879577561. The cubic root of 61718118 is about 395.1884333010.

The spelling of 61718118 in words is "sixty-one million, seven hundred eighteen thousand, one hundred eighteen".