51056605601666 has 16 divisors (see below), whose sum is σ = 90543734072640. Its totient is φ = 21126871283280.

The previous prime is 51056605601657. The next prime is 51056605601669. The reversal of 51056605601666 is 66610650665015.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51056605601669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62877592700 + ... + 62877593511.

It is an arithmetic number, because the mean of its divisors is an integer number (5658983379540).

Almost surely, 2^{51056605601666} is an apocalyptic number.

51056605601666 is a deficient number, since it is larger than the sum of its proper divisors (39487128470974).

51056605601666 is a wasteful number, since it uses less digits than its factorization.

51056605601666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125755186249.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 51056605601666 in words is "fifty-one trillion, fifty-six billion, six hundred five million, six hundred one thousand, six hundred sixty-six".