51661555656110 has 16 divisors (see below), whose sum is σ = 93287895394896. Its totient is φ = 20598601103808.

The previous prime is 51661555656079. The next prime is 51661555656143. The reversal of 51661555656110 is 1165655516615.

It is a super-2 number, since 2×51661555656110² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

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, 8252641544 + ... + 8252647803.

It is an arithmetic number, because the mean of its divisors is an integer number (5830493462181).

Almost surely, 2^{51661555656110} is an apocalyptic number.

51661555656110 is a deficient number, since it is larger than the sum of its proper divisors (41626339738786).

51661555656110 is a wasteful number, since it uses less digits than its factorization.

51661555656110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16505289667.

The product of its (nonzero) digits is 4050000, while the sum is 53.

The spelling of 51661555656110 in words is "fifty-one trillion, six hundred sixty-one billion, five hundred fifty-five million, six hundred fifty-six thousand, one hundred ten".