61506006505 has 8 divisors (see below), whose sum is σ = 73825424712. Its totient is φ = 49192660608.

The previous prime is 61506006493. The next prime is 61506006589. The reversal of 61506006505 is 50560060516.

61506006505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 23080597929 + 38425408576 = 151923^2 + 196024^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61506006505 - 2¹¹ = 61506004457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495762 + ... + 1536331.

It is an arithmetic number, because the mean of its divisors is an integer number (9228178089).

Almost surely, 2^61506006505 is an apocalyptic number.

It is an amenable number.

61506006505 is a deficient number, since it is larger than the sum of its proper divisors (12319418207).

61506006505 is a wasteful number, since it uses less digits than its factorization.

61506006505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036155.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 61506006505 in words is "sixty-one billion, five hundred six million, six thousand, five hundred five".