16634075521 has 16 divisors (see below), whose sum is σ = 20419312000. Its totient is φ = 13507364304.

The previous prime is 16634075503. The next prime is 16634075539. The reversal of 16634075521 is 12557043661.

It is an interprime number because it is at equal distance from previous prime (16634075503) and next prime (16634075539).

It is not a de Polignac number, because 16634075521 - 2⁹ = 16634075009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16634075021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1269690 + ... + 1282723.

It is an arithmetic number, because the mean of its divisors is an integer number (1276207000).

Almost surely, 2^16634075521 is an apocalyptic number.

It is an amenable number.

16634075521 is a deficient number, since it is larger than the sum of its proper divisors (3785236479).

16634075521 is an equidigital number, since it uses as much as digits as its factorization.

16634075521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552453 (or 2552439 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 16634075521 in words is "sixteen billion, six hundred thirty-four million, seventy-five thousand, five hundred twenty-one".