61294641561 has 12 divisors (see below), whose sum is σ = 88663014180. Its totient is φ = 40804797600.

The previous prime is 61294641559. The next prime is 61294641659. The reversal of 61294641561 is 16514649216.

61294641561 is a `hidden beast` number, since 6 + 1 + 2 + 9 + 46 + 41 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 56349739161 + 4944902400 = 237381^2 + 70320^2 .

It is not a de Polignac number, because 61294641561 - 2¹ = 61294641559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61294641061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4851406 + ... + 4864023.

It is an arithmetic number, because the mean of its divisors is an integer number (7388584515).

Almost surely, 2^61294641561 is an apocalyptic number.

It is an amenable number.

61294641561 is a deficient number, since it is larger than the sum of its proper divisors (27368372619).

61294641561 is a wasteful number, since it uses less digits than its factorization.

61294641561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9716136 (or 9716133 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 61294641561 in words is "sixty-one billion, two hundred ninety-four million, six hundred forty-one thousand, five hundred sixty-one".