161754408857 has 2 divisors, whose sum is σ = 161754408858. Its totient is φ = 161754408856.

The previous prime is 161754408847. The next prime is 161754408869. The reversal of 161754408857 is 758804457161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159331898896 + 2422509961 = 399164^2 + 49219^2 .

It is a cyclic number.

It is not a de Polignac number, because 161754408857 - 2¹⁰ = 161754407833 is a prime.

It is a super-3 number, since 3×161754408857³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (161754408847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80877204428 + 80877204429.

It is an arithmetic number, because the mean of its divisors is an integer number (80877204429).

Almost surely, 2^161754408857 is an apocalyptic number.

It is an amenable number.

161754408857 is a deficient number, since it is larger than the sum of its proper divisors (1).

161754408857 is an equidigital number, since it uses as much as digits as its factorization.

161754408857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7526400, while the sum is 56.

The spelling of 161754408857 in words is "one hundred sixty-one billion, seven hundred fifty-four million, four hundred eight thousand, eight hundred fifty-seven".