61531868332505 has 16 divisors (see below), whose sum is σ = 75843200591424. Its totient is φ = 47906559433920.

The previous prime is 61531868332453. The next prime is 61531868332547. The reversal of 61531868332505 is 50523386813516.

It is not a de Polignac number, because 61531868332505 - 2¹⁰ = 61531868331481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1106461466 + ... + 1106517075.

It is an arithmetic number, because the mean of its divisors is an integer number (4740200036964).

Almost surely, 2^{61531868332505} is an apocalyptic number.

It is an amenable number.

61531868332505 is a deficient number, since it is larger than the sum of its proper divisors (14311332258919).

61531868332505 is a wasteful number, since it uses less digits than its factorization.

61531868332505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212978696.

The product of its (nonzero) digits is 15552000, while the sum is 56.

The spelling of 61531868332505 in words is "sixty-one trillion, five hundred thirty-one billion, eight hundred sixty-eight million, three hundred thirty-two thousand, five hundred five".