61156500505 has 16 divisors (see below), whose sum is σ = 76030675920. Its totient is φ = 47168273152.

The previous prime is 61156500491. The next prime is 61156500523. The reversal of 61156500505 is 50500565116.

It can be written as a sum of positive squares in 8 ways, for example, as 26904969 + 61129595536 = 5187^2 + 247244^2 .

It is a cyclic number.

It is not a de Polignac number, because 61156500505 - 2⁵ = 61156500473 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213334 + ... + 409663.

It is an arithmetic number, because the mean of its divisors is an integer number (4751917245).

Almost surely, 2^61156500505 is an apocalyptic number.

It is an amenable number.

61156500505 is a deficient number, since it is larger than the sum of its proper divisors (14874175415).

61156500505 is a wasteful number, since it uses less digits than its factorization.

61156500505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623708.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 61156500505 in words is "sixty-one billion, one hundred fifty-six million, five hundred thousand, five hundred five".