51656551561166 has 16 divisors (see below), whose sum is σ = 77509336310160. Its totient is φ = 25820106600960.

The previous prime is 51656551561151. The next prime is 51656551561193. The reversal of 51656551561166 is 66116515565615.

It is a congruent 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, 261362030 + ... + 261559598.

It is an arithmetic number, because the mean of its divisors is an integer number (4844333519385).

Almost surely, 2^{51656551561166} is an apocalyptic number.

51656551561166 is a deficient number, since it is larger than the sum of its proper divisors (25852784748994).

51656551561166 is a wasteful number, since it uses less digits than its factorization.

51656551561166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238259.

The product of its digits is 24300000, while the sum is 59.

The spelling of 51656551561166 in words is "fifty-one trillion, six hundred fifty-six billion, five hundred fifty-one million, five hundred sixty-one thousand, one hundred sixty-six".