161580853871 has 2 divisors, whose sum is σ = 161580853872. Its totient is φ = 161580853870.

The previous prime is 161580853787. The next prime is 161580853933. The reversal of 161580853871 is 178358085161.

It is a strong prime.

It is an emirp because it is prime and its reverse (178358085161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161580853871 is a prime.

It is a super-2 number, since 2×161580853871² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161580853271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80790426935 + 80790426936.

It is an arithmetic number, because the mean of its divisors is an integer number (80790426936).

Almost surely, 2^161580853871 is an apocalyptic number.

161580853871 is a deficient number, since it is larger than the sum of its proper divisors (1).

161580853871 is an equidigital number, since it uses as much as digits as its factorization.

161580853871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 53.

The spelling of 161580853871 in words is "one hundred sixty-one billion, five hundred eighty million, eight hundred fifty-three thousand, eight hundred seventy-one".