51666201266 has 32 divisors (see below), whose sum is σ = 82620283392. Its totient is φ = 24196743360.

The previous prime is 51666201259. The next prime is 51666201281. The reversal of 51666201266 is 66210266615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90395 + ... + 333921.

It is an arithmetic number, because the mean of its divisors is an integer number (2581883856).

Almost surely, 2^51666201266 is an apocalyptic number.

51666201266 is a deficient number, since it is larger than the sum of its proper divisors (30954082126).

51666201266 is a wasteful number, since it uses less digits than its factorization.

51666201266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243674.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 51666201266 in words is "fifty-one billion, six hundred sixty-six million, two hundred one thousand, two hundred sixty-six".