51155156550 has 48 divisors (see below), whose sum is σ = 126900694800. Its totient is φ = 13637514240.

The previous prime is 51155156539. The next prime is 51155156587. The reversal of 51155156550 is 5565155115.

It is a junction number, because it is equal to n+sod(n) for n = 51155156499 and 51155156508.

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, 504526 + ... + 597374.

It is an arithmetic number, because the mean of its divisors is an integer number (2643764475).

Almost surely, 2^51155156550 is an apocalyptic number.

51155156550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51155156550 is an abundant number, since it is smaller than the sum of its proper divisors (75745538250).

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

51155156550 is a wasteful number, since it uses less digits than its factorization.

51155156550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96537 (or 96532 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 39.

The spelling of 51155156550 in words is "fifty-one billion, one hundred fifty-five million, one hundred fifty-six thousand, five hundred fifty".