16625978033 has 4 divisors (see below), whose sum is σ = 19001117760. Its totient is φ = 14250838308.

The previous prime is 16625978021. The next prime is 16625978041. The reversal of 16625978033 is 33087952661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33087952661 = 89 ⋅371774749.

It is not a de Polignac number, because 16625978033 - 2⁶ = 16625977969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16625978093) 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, 1187569853 + ... + 1187569866.

It is an arithmetic number, because the mean of its divisors is an integer number (4750279440).

Almost surely, 2^16625978033 is an apocalyptic number.

It is an amenable number.

16625978033 is a deficient number, since it is larger than the sum of its proper divisors (2375139727).

16625978033 is an equidigital number, since it uses as much as digits as its factorization.

16625978033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375139726.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 16625978033 in words is "sixteen billion, six hundred twenty-five million, nine hundred seventy-eight thousand, thirty-three".