16508725421 has 8 divisors (see below), whose sum is σ = 16894389600. Its totient is φ = 16123140432.

The previous prime is 16508725403. The next prime is 16508725439. The reversal of 16508725421 is 12452780561.

It is an interprime number because it is at equal distance from previous prime (16508725403) and next prime (16508725439).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16508725421 is a prime.

It is a super-3 number, since 3×16508725421³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16508725021) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 724031 + ... + 746483.

It is an arithmetic number, because the mean of its divisors is an integer number (2111798700).

Almost surely, 2^16508725421 is an apocalyptic number.

It is an amenable number.

16508725421 is a deficient number, since it is larger than the sum of its proper divisors (385664179).

16508725421 is a wasteful number, since it uses less digits than its factorization.

16508725421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39595.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 16508725421 in words is "sixteen billion, five hundred eight million, seven hundred twenty-five thousand, four hundred twenty-one".