16425813809 has 2 divisors, whose sum is σ = 16425813810. Its totient is φ = 16425813808.

The previous prime is 16425813799. The next prime is 16425813821. The reversal of 16425813809 is 90831852461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10415223025 + 6010590784 = 102055^2 + 77528^2 .

It is a cyclic number.

It is not a de Polignac number, because 16425813809 - 2²⁴ = 16409036593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16425813869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8212906904 + 8212906905.

It is an arithmetic number, because the mean of its divisors is an integer number (8212906905).

Almost surely, 2^16425813809 is an apocalyptic number.

It is an amenable number.

16425813809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16425813809 is an equidigital number, since it uses as much as digits as its factorization.

16425813809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 16425813809 in words is "sixteen billion, four hundred twenty-five million, eight hundred thirteen thousand, eight hundred nine".