16524345661 has 8 divisors (see below), whose sum is σ = 17923107384. Its totient is φ = 15172999680.

The previous prime is 16524345647. The next prime is 16524345697. The reversal of 16524345661 is 16654342561.

It can be written as a sum of positive squares in 4 ways, for example, as 158004900 + 16366340761 = 12570^2 + 127931^2 .

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 16524345661 - 2⁷ = 16524345533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16524345161) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11853210 + ... + 11854603.

It is an arithmetic number, because the mean of its divisors is an integer number (2240388423).

Almost surely, 2^16524345661 is an apocalyptic number.

It is an amenable number.

16524345661 is a deficient number, since it is larger than the sum of its proper divisors (1398761723).

16524345661 is a wasteful number, since it uses less digits than its factorization.

16524345661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23707871.

The product of its digits is 518400, while the sum is 43.

The spelling of 16524345661 in words is "sixteen billion, five hundred twenty-four million, three hundred forty-five thousand, six hundred sixty-one".