16977625856809 has 2 divisors, whose sum is σ = 16977625856810. Its totient is φ = 16977625856808.

The previous prime is 16977625856797. The next prime is 16977625856969. The reversal of 16977625856809 is 90865852677961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10645341798400 + 6332284058409 = 3262720^2 + 2516403^2 .

It is a cyclic number.

It is not a de Polignac number, because 16977625856809 - 2³³ = 16969035922217 is a prime.

It is not a weakly prime, because it can be changed into another prime (16977625856509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8488812928404 + 8488812928405.

It is an arithmetic number, because the mean of its divisors is an integer number (8488812928405).

Almost surely, 2^{16977625856809} is an apocalyptic number.

It is an amenable number.

16977625856809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16977625856809 is an equidigital number, since it uses as much as digits as its factorization.

16977625856809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2743372800, while the sum is 79.

The spelling of 16977625856809 in words is "sixteen trillion, nine hundred seventy-seven billion, six hundred twenty-five million, eight hundred fifty-six thousand, eight hundred nine".