61605302985 has 24 divisors (see below), whose sum is σ = 106828477704. Its totient is φ = 32842022400.

The previous prime is 61605302977. The next prime is 61605302999. The reversal of 61605302985 is 58920350616.

61605302985 is a `hidden beast` number, since 6 + 1 + 605 + 30 + 2 + 9 + 8 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 449991369 + 61155311616 = 21213^2 + 247296^2 .

It is not a de Polignac number, because 61605302985 - 2³ = 61605302977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 61605302985.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188416 + ... + 398385.

It is an arithmetic number, because the mean of its divisors is an integer number (4451186571).

Almost surely, 2^61605302985 is an apocalyptic number.

It is an amenable number.

61605302985 is a deficient number, since it is larger than the sum of its proper divisors (45223174719).

61605302985 is a wasteful number, since it uses less digits than its factorization.

61605302985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589145 (or 589142 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 61605302985 in words is "sixty-one billion, six hundred five million, three hundred two thousand, nine hundred eighty-five".