16851536550 has 36 divisors (see below), whose sum is σ = 45274462740. Its totient is φ = 4493742960.

The previous prime is 16851536509. The next prime is 16851536551. The reversal of 16851536550 is 5563515861.

16851536550 is a `hidden beast` number, since 1 + 6 + 85 + 15 + 3 + 6 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 16851536496 and 16851536505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16851536551) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18723480 + ... + 18724379.

It is an arithmetic number, because the mean of its divisors is an integer number (1257623965).

Almost surely, 2^16851536550 is an apocalyptic number.

16851536550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16851536550 is an abundant number, since it is smaller than the sum of its proper divisors (28422926190).

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

16851536550 is a wasteful number, since it uses less digits than its factorization.

16851536550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37447877 (or 37447869 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 16851536550 in words is "sixteen billion, eight hundred fifty-one million, five hundred thirty-six thousand, five hundred fifty".