61803985578 has 32 divisors (see below), whose sum is σ = 124933881600. Its totient is φ = 20380925376.

The previous prime is 61803985577. The next prime is 61803985583. The reversal of 61803985578 is 87558930816.

It is not an unprimeable number, because it can be changed into a prime (61803985577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354703 + ... + 499421.

It is an arithmetic number, because the mean of its divisors is an integer number (3904183800).

Almost surely, 2^61803985578 is an apocalyptic number.

61803985578 is an abundant number, since it is smaller than the sum of its proper divisors (63129896022).

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

61803985578 is a wasteful number, since it uses less digits than its factorization.

61803985578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145486.

The product of its (nonzero) digits is 14515200, while the sum is 60.

The spelling of 61803985578 in words is "sixty-one billion, eight hundred three million, nine hundred eighty-five thousand, five hundred seventy-eight".