51423217331666 has 16 divisors (see below), whose sum is σ = 78496182561600. Its totient is φ = 25258422996048.

The previous prime is 51423217331621. The next prime is 51423217331683. The reversal of 51423217331666 is 66613371232415.

It is a happy number.

It is a Curzon number.

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, 149790686 + ... + 150133593.

It is an arithmetic number, because the mean of its divisors is an integer number (4906011410100).

Almost surely, 2^{51423217331666} is an apocalyptic number.

51423217331666 is a deficient number, since it is larger than the sum of its proper divisors (27072965229934).

51423217331666 is a wasteful number, since it uses less digits than its factorization.

51423217331666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299925793.

The product of its digits is 3265920, while the sum is 50.

The spelling of 51423217331666 in words is "fifty-one trillion, four hundred twenty-three billion, two hundred seventeen million, three hundred thirty-one thousand, six hundred sixty-six".