1609090971857 has 2 divisors, whose sum is σ = 1609090971858. Its totient is φ = 1609090971856.

The previous prime is 1609090971821. The next prime is 1609090971863. The reversal of 1609090971857 is 7581790909061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1334854418881 + 274236552976 = 1155359^2 + 523676^2 .

It is a cyclic number.

It is not a de Polignac number, because 1609090971857 - 2¹⁶ = 1609090906321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1609090971857.

It is not a weakly prime, because it can be changed into another prime (1609090971157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804545485928 + 804545485929.

It is an arithmetic number, because the mean of its divisors is an integer number (804545485929).

Almost surely, 2^{1609090971857} is an apocalyptic number.

It is an amenable number.

1609090971857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1609090971857 is an equidigital number, since it uses as much as digits as its factorization.

1609090971857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8573040, while the sum is 62.

The spelling of 1609090971857 in words is "one trillion, six hundred nine billion, ninety million, nine hundred seventy-one thousand, eight hundred fifty-seven".