51510616656166 has 4 divisors (see below), whose sum is σ = 77265924984252. Its totient is φ = 25755308328082.

The previous prime is 51510616656151. The next prime is 51510616656209. The reversal of 51510616656166 is 66165661601515.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×51510616656166² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12877654164040 + ... + 12877654164043.

It is an arithmetic number, because the mean of its divisors is an integer number (19316481246063).

Almost surely, 2^{51510616656166} is an apocalyptic number.

51510616656166 is a deficient number, since it is larger than the sum of its proper divisors (25755308328086).

51510616656166 is a wasteful number, since it uses less digits than its factorization.

51510616656166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25755308328085.

The product of its (nonzero) digits is 5832000, while the sum is 55.

The spelling of 51510616656166 in words is "fifty-one trillion, five hundred ten billion, six hundred sixteen million, six hundred fifty-six thousand, one hundred sixty-six".