16551972 has 24 divisors (see below), whose sum is σ = 42912800. Its totient is φ = 5517288.

The previous prime is 16551971. The next prime is 16551989. The reversal of 16551972 is 27915561.

16551972 is a `hidden beast` number, since 16 + 551 + 97 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (16551971) 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, 76522 + ... + 76737.

Almost surely, 2^16551972 is an apocalyptic number.

16551972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16551972 is an abundant number, since it is smaller than the sum of its proper divisors (26360828).

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

16551972 is a wasteful number, since it uses less digits than its factorization.

16551972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153272 (or 153264 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 16551972 is about 4068.4114836137. The cubic root of 16551972 is about 254.8491841763.

The spelling of 16551972 in words is "sixteen million, five hundred fifty-one thousand, nine hundred seventy-two".