16398989625 has 16 divisors (see below), whose sum is σ = 27287919360. Its totient is φ = 8746127600.

The previous prime is 16398989611. The next prime is 16398989639. The reversal of 16398989625 is 52698989361.

It is an interprime number because it is at equal distance from previous prime (16398989611) and next prime (16398989639).

It is not a de Polignac number, because 16398989625 - 2⁴ = 16398989609 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21864945 + ... + 21865694.

It is an arithmetic number, because the mean of its divisors is an integer number (1705494960).

Almost surely, 2^16398989625 is an apocalyptic number.

16398989625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16398989625 is a deficient number, since it is larger than the sum of its proper divisors (10888929735).

16398989625 is an equidigital number, since it uses as much as digits as its factorization.

16398989625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43730657 (or 43730647 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 66.

The spelling of 16398989625 in words is "sixteen billion, three hundred ninety-eight million, nine hundred eighty-nine thousand, six hundred twenty-five".