16551340 has 24 divisors (see below), whose sum is σ = 37432080. Its totient is φ = 6111168.

The previous prime is 16551287. The next prime is 16551341. The reversal of 16551340 is 4315561.

It is not an unprimeable number, because it can be changed into a prime (16551341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31570 + ... + 32089.

It is an arithmetic number, because the mean of its divisors is an integer number (1559670).

Almost surely, 2^16551340 is an apocalyptic number.

16551340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16551340 is an abundant number, since it is smaller than the sum of its proper divisors (20880740).

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

16551340 is a wasteful number, since it uses less digits than its factorization.

16551340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63681 (or 63679 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 16551340 is about 4068.3338112795. Note that the first 3 decimals coincide. The cubic root of 16551340 is about 254.8459405198.

The spelling of 16551340 in words is "sixteen million, five hundred fifty-one thousand, three hundred forty".