16530470657 has 4 divisors (see below), whose sum is σ = 16567287300. Its totient is φ = 16493654016.

The previous prime is 16530470629. The next prime is 16530470683. The reversal of 16530470657 is 75607403561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3605281936 + 12925188721 = 60044^2 + 113689^2 .

It is a cyclic number.

It is not a de Polignac number, because 16530470657 - 2¹⁴ = 16530454273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16530470617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18407648 + ... + 18408545.

It is an arithmetic number, because the mean of its divisors is an integer number (4141821825).

Almost surely, 2^16530470657 is an apocalyptic number.

It is an amenable number.

16530470657 is a deficient number, since it is larger than the sum of its proper divisors (36816643).

16530470657 is an equidigital number, since it uses as much as digits as its factorization.

16530470657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36816642.

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 16530470657 in words is "sixteen billion, five hundred thirty million, four hundred seventy thousand, six hundred fifty-seven".