16066861578 has 48 divisors (see below), whose sum is σ = 34992397440. Its totient is φ = 5327866368.

The previous prime is 16066861441. The next prime is 16066861579. The reversal of 16066861578 is 87516866061.

16066861578 is a `hidden beast` number, since 1 + 6 + 0 + 6 + 6 + 8 + 61 + 578 = 666.

It is a super-2 number, since 2×16066861578² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16066861579) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3185983 + ... + 3191021.

It is an arithmetic number, because the mean of its divisors is an integer number (729008280).

Almost surely, 2^16066861578 is an apocalyptic number.

16066861578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16066861578 is an abundant number, since it is smaller than the sum of its proper divisors (18925535862).

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

16066861578 is a wasteful number, since it uses less digits than its factorization.

16066861578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5931 (or 5928 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 16066861578 in words is "sixteen billion, sixty-six million, eight hundred sixty-one thousand, five hundred seventy-eight".