51066556156550 has 48 divisors (see below), whose sum is σ = 103619405647872. Its totient is φ = 18569527610400.

The previous prime is 51066556156529. The next prime is 51066556156591. The reversal of 51066556156550 is 5565165566015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118575707 + ... + 119005593.

It is an arithmetic number, because the mean of its divisors is an integer number (2158737617664).

Almost surely, 2^{51066556156550} is an apocalyptic number.

51066556156550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51066556156550 is an abundant number, since it is smaller than the sum of its proper divisors (52552849491322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51066556156550 is a wasteful number, since it uses less digits than its factorization.

51066556156550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645893 (or 645888 counting only the distinct ones).

The product of its (nonzero) digits is 20250000, while the sum is 56.

The spelling of 51066556156550 in words is "fifty-one trillion, sixty-six billion, five hundred fifty-six million, one hundred fifty-six thousand, five hundred fifty".