61566386747 has 4 divisors (see below), whose sum is σ = 61580949120. Its totient is φ = 61551824376.

The previous prime is 61566386711. The next prime is 61566386797. The reversal of 61566386747 is 74768366516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61566386747 - 2¹⁶ = 61566321211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61566386797) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7274843 + ... + 7283300.

It is an arithmetic number, because the mean of its divisors is an integer number (15395237280).

Almost surely, 2^61566386747 is an apocalyptic number.

61566386747 is a deficient number, since it is larger than the sum of its proper divisors (14562373).

61566386747 is a wasteful number, since it uses less digits than its factorization.

61566386747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14562372.

The product of its digits is 30481920, while the sum is 59.

The spelling of 61566386747 in words is "sixty-one billion, five hundred sixty-six million, three hundred eighty-six thousand, seven hundred forty-seven".