61618689858 has 32 divisors (see below), whose sum is σ = 134482980672. Its totient is φ = 18666468800.

The previous prime is 61618689827. The next prime is 61618689947. The reversal of 61618689858 is 85898681616.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67660 + ... + 357512.

It is an arithmetic number, because the mean of its divisors is an integer number (4202593146).

Almost surely, 2^61618689858 is an apocalyptic number.

61618689858 is an abundant number, since it is smaller than the sum of its proper divisors (72864290814).

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

61618689858 is a wasteful number, since it uses less digits than its factorization.

61618689858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293090.

The product of its digits is 39813120, while the sum is 66.

The spelling of 61618689858 in words is "sixty-one billion, six hundred eighteen million, six hundred eighty-nine thousand, eight hundred fifty-eight".