171785078053 has 2 divisors, whose sum is σ = 171785078054. Its totient is φ = 171785078052.

The previous prime is 171785078027. The next prime is 171785078071. The reversal of 171785078053 is 350870587171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168742673089 + 3042404964 = 410783^2 + 55158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171785078053 is a prime.

It is a super-2 number, since 2×171785078053² (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 (171785078083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85892539026 + 85892539027.

It is an arithmetic number, because the mean of its divisors is an integer number (85892539027).

Almost surely, 2^171785078053 is an apocalyptic number.

It is an amenable number.

171785078053 is a deficient number, since it is larger than the sum of its proper divisors (1).

171785078053 is an equidigital number, since it uses as much as digits as its factorization.

171785078053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1646400, while the sum is 52.

The spelling of 171785078053 in words is "one hundred seventy-one billion, seven hundred eighty-five million, seventy-eight thousand, fifty-three".