116661558 has 64 divisors (see below), whose sum is σ = 266434560. Its totient is φ = 33758208.

The previous prime is 116661557. The next prime is 116661569. The reversal of 116661558 is 855166611.

It is a super-2 number, since 2×116661558² = 27219838229974728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116661551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330310 + ... + 330662.

It is an arithmetic number, because the mean of its divisors is an integer number (4163040).

Almost surely, 2^116661558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 116661558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133217280).

116661558 is an abundant number, since it is smaller than the sum of its proper divisors (149773002).

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

116661558 is a wasteful number, since it uses less digits than its factorization.

116661558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613.

The product of its digits is 43200, while the sum is 39.

The square root of 116661558 is about 10800.9980094434. The cubic root of 116661558 is about 488.6252706837.

The spelling of 116661558 in words is "one hundred sixteen million, six hundred sixty-one thousand, five hundred fifty-eight".