61000005609 has 40 divisors (see below), whose sum is σ = 96259062240. Its totient is φ = 38389909824.

The previous prime is 61000005607. The next prime is 61000005617. The reversal of 61000005609 is 90650000016.

It is not a de Polignac number, because 61000005609 - 2¹ = 61000005607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61000005607) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 365509 + ... + 505565.

It is an arithmetic number, because the mean of its divisors is an integer number (2406476556).

Almost surely, 2^61000005609 is an apocalyptic number.

It is an amenable number.

61000005609 is a deficient number, since it is larger than the sum of its proper divisors (35259056631).

61000005609 is a wasteful number, since it uses less digits than its factorization.

61000005609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140371 (or 140362 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The spelling of 61000005609 in words is "sixty-one billion, five thousand, six hundred nine".