51165166650 has 96 divisors (see below), whose sum is σ = 138575380608. Its totient is φ = 12417081600.

The previous prime is 51165166643. The next prime is 51165166651. The reversal of 51165166650 is 5666156115.

It is not an unprimeable number, because it can be changed into a prime (51165166651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46329 + ... + 323228.

It is an arithmetic number, because the mean of its divisors is an integer number (1443493548).

Almost surely, 2^51165166650 is an apocalyptic number.

51165166650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51165166650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69287690304).

51165166650 is an abundant number, since it is smaller than the sum of its proper divisors (87410213958).

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

51165166650 is a wasteful number, since it uses less digits than its factorization.

51165166650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369656 (or 369651 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 51165166650 in words is "fifty-one billion, one hundred sixty-five million, one hundred sixty-six thousand, six hundred fifty".