16551621067 has 4 divisors (see below), whose sum is σ = 16552276776. Its totient is φ = 16550965360.

The previous prime is 16551621041. The next prime is 16551621113. The reversal of 16551621067 is 76012615561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76012615561 = 1039 ⋅73159399.

It is a cyclic number.

It is not a de Polignac number, because 16551621067 - 2¹⁵ = 16551588299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16551621007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288409 + ... + 341002.

It is an arithmetic number, because the mean of its divisors is an integer number (4138069194).

Almost surely, 2^16551621067 is an apocalyptic number.

16551621067 is a deficient number, since it is larger than the sum of its proper divisors (655709).

16551621067 is an equidigital number, since it uses as much as digits as its factorization.

16551621067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655708.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 16551621067 in words is "sixteen billion, five hundred fifty-one million, six hundred twenty-one thousand, sixty-seven".