51065105661 has 12 divisors (see below), whose sum is σ = 73767256992. Its totient is φ = 34040381256.

The previous prime is 51065105647. The next prime is 51065105669. The reversal of 51065105661 is 16650156015.

It is not a de Polignac number, because 51065105661 - 2¹³ = 51065097469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51065105669) 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, 142371 + ... + 349856.

It is an arithmetic number, because the mean of its divisors is an integer number (6147271416).

Almost surely, 2^51065105661 is an apocalyptic number.

It is an amenable number.

51065105661 is a deficient number, since it is larger than the sum of its proper divisors (22702151331).

51065105661 is a wasteful number, since it uses less digits than its factorization.

51065105661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503760 (or 503757 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 51065105661 in words is "fifty-one billion, sixty-five million, one hundred five thousand, six hundred sixty-one".