16681530 has 16 divisors (see below), whose sum is σ = 40035744. Its totient is φ = 4448400.

The previous prime is 16681523. The next prime is 16681579. The reversal of 16681530 is 3518661.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 556051 = 16681530 / (1 + 6 + 6 + 8 + 1 + 5 + 3 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277996 + ... + 278055.

It is an arithmetic number, because the mean of its divisors is an integer number (2502234).

Almost surely, 2^16681530 is an apocalyptic number.

16681530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16681530 is an abundant number, since it is smaller than the sum of its proper divisors (23354214).

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

16681530 is a wasteful number, since it uses less digits than its factorization.

16681530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556061.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 16681530 is about 4084.3028780932. The cubic root of 16681530 is about 255.5123876536.

The spelling of 16681530 in words is "sixteen million, six hundred eighty-one thousand, five hundred thirty".