16667601678 has 144 divisors (see below), whose sum is σ = 44818076160. Its totient is φ = 4383377856.

The previous prime is 16667601661. The next prime is 16667601683. The reversal of 16667601678 is 87610676661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9347175 + ... + 9348957.

It is an arithmetic number, because the mean of its divisors is an integer number (311236640).

Almost surely, 2^16667601678 is an apocalyptic number.

16667601678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16667601678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22409038080).

16667601678 is an abundant number, since it is smaller than the sum of its proper divisors (28150474482).

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

16667601678 is a wasteful number, since it uses less digits than its factorization.

16667601678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2247 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 16667601678 in words is "sixteen billion, six hundred sixty-seven million, six hundred one thousand, six hundred seventy-eight".