16520251261667 has 8 divisors (see below), whose sum is σ = 16678310905872. Its totient is φ = 16362675721600.

The previous prime is 16520251261663. The next prime is 16520251261681. The reversal of 16520251261667 is 76616215202561.

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

It is a cyclic number.

It is not a de Polignac number, because 16520251261667 - 2² = 16520251261663 is a prime.

It is a super-2 number, since 2×16520251261667² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16520251261663) 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, 120957458 + ... + 121093959.

It is an arithmetic number, because the mean of its divisors is an integer number (2084788863234).

Almost surely, 2^{16520251261667} is an apocalyptic number.

16520251261667 is a deficient number, since it is larger than the sum of its proper divisors (158059644205).

16520251261667 is a wasteful number, since it uses less digits than its factorization.

16520251261667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242052069.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 16520251261667 in words is "sixteen trillion, five hundred twenty billion, two hundred fifty-one million, two hundred sixty-one thousand, six hundred sixty-seven".