18409954977 has 12 divisors (see below), whose sum is σ = 26605289620. Its totient is φ = 12267242208.

The previous prime is 18409954933. The next prime is 18409954999. The reversal of 18409954977 is 77945990481.

18409954977 is a `hidden beast` number, since 1 + 84 + 0 + 9 + 9 + 549 + 7 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17200584801 + 1209370176 = 131151^2 + 34776^2 .

It is not a de Polignac number, because 18409954977 - 2¹⁴ = 18409938593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18409954907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 485818 + ... + 522339.

Almost surely, 2^18409954977 is an apocalyptic number.

It is an amenable number.

18409954977 is a deficient number, since it is larger than the sum of its proper divisors (8195334643).

18409954977 is a wasteful number, since it uses less digits than its factorization.

18409954977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010192 (or 1010189 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 18409954977 in words is "eighteen billion, four hundred nine million, nine hundred fifty-four thousand, nine hundred seventy-seven".