61561666506610 has 16 divisors (see below), whose sum is σ = 113168680557696. Its totient is φ = 24100737525808.

The previous prime is 61561666506601. The next prime is 61561666506671. The reversal of 61561666506610 is 1660566616516.

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, 65491134112 + ... + 65491135051.

It is an arithmetic number, because the mean of its divisors is an integer number (7073042534856).

Almost surely, 2^{61561666506610} is an apocalyptic number.

61561666506610 is a deficient number, since it is larger than the sum of its proper divisors (51607014051086).

61561666506610 is a wasteful number, since it uses less digits than its factorization.

61561666506610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130982269217.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 61561666506610 in words is "sixty-one trillion, five hundred sixty-one billion, six hundred sixty-six million, five hundred six thousand, six hundred ten".