16618378050 has 72 divisors (see below), whose sum is σ = 47274419556. Its totient is φ = 4170885120.

The previous prime is 16618378037. The next prime is 16618378093. The reversal of 16618378050 is 5087381661.

It can be written as a sum of positive squares in 6 ways, for example, as 10241237601 + 6377140449 = 101199^2 + 79857^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16618377987 and 16618378005.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1078519 + ... + 1093818.

Almost surely, 2^16618378050 is an apocalyptic number.

16618378050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16618378050 is an abundant number, since it is smaller than the sum of its proper divisors (30656041506).

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

16618378050 is a wasteful number, since it uses less digits than its factorization.

16618378050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172372 (or 2172364 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 16618378050 in words is "sixteen billion, six hundred eighteen million, three hundred seventy-eight thousand, fifty".