16220347457 has 4 divisors (see below), whose sum is σ = 16236360660. Its totient is φ = 16204334256.

The previous prime is 16220347421. The next prime is 16220347499. The reversal of 16220347457 is 75474302261.

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 1351959361 + 14868388096 = 36769^2 + 121936^2 .

It is a cyclic number.

It is not a de Polignac number, because 16220347457 - 2⁶ = 16220347393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16220347357) 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, 8005082 + ... + 8007107.

It is an arithmetic number, because the mean of its divisors is an integer number (4059090165).

Almost surely, 2^16220347457 is an apocalyptic number.

It is an amenable number.

16220347457 is a deficient number, since it is larger than the sum of its proper divisors (16013203).

16220347457 is a wasteful number, since it uses less digits than its factorization.

16220347457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16013202.

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 16220347457 in words is "sixteen billion, two hundred twenty million, three hundred forty-seven thousand, four hundred fifty-seven".