2061509985 has 12 divisors (see below), whose sum is σ = 3573284052. Its totient is φ = 1099471968.

The previous prime is 2061509939. The next prime is 2061510001. The reversal of 2061509985 is 5899051602.

2061509985 is a `hidden beast` number, since 2 + 0 + 61 + 509 + 9 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1615075344 + 446434641 = 40188^2 + 21129^2 .

It is not a de Polignac number, because 2061509985 - 2⁸ = 2061509729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 45811333 = 2061509985 / (2 + 0 + 6 + 1 + 5 + 0 + 9 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 2061509985.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22905622 + ... + 22905711.

It is an arithmetic number, because the mean of its divisors is an integer number (297773671).

Almost surely, 2^2061509985 is an apocalyptic number.

It is an amenable number.

2061509985 is a deficient number, since it is larger than the sum of its proper divisors (1511774067).

2061509985 is a wasteful number, since it uses less digits than its factorization.

2061509985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45811344 (or 45811341 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 2061509985 is about 45403.8542967445. The cubic root of 2061509985 is about 1272.7071409980.

The spelling of 2061509985 in words is "two billion, sixty-one million, five hundred nine thousand, nine hundred eighty-five".