16553801625 has 16 divisors (see below), whose sum is σ = 27545526528. Its totient is φ = 8828694000.

The previous prime is 16553801611. The next prime is 16553801657. The reversal of 16553801625 is 52610835561.

It is a happy number.

It is not a de Polignac number, because 16553801625 - 2⁴ = 16553801609 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22071361 + ... + 22072110.

It is an arithmetic number, because the mean of its divisors is an integer number (1721595408).

Almost surely, 2^16553801625 is an apocalyptic number.

16553801625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16553801625 is a deficient number, since it is larger than the sum of its proper divisors (10991724903).

16553801625 is an equidigital number, since it uses as much as digits as its factorization.

16553801625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44143489 (or 44143479 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 16553801625 in words is "sixteen billion, five hundred fifty-three million, eight hundred one thousand, six hundred twenty-five".