161655761012546 has 4 divisors (see below), whose sum is σ = 242483641518822. Its totient is φ = 80827880506272.

The previous prime is 161655761012491. The next prime is 161655761012563. The reversal of 161655761012546 is 645210167556161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 83122223545321 + 78533537467225 = 9117139^2 + 8861915^2 .

It is a super-2 number, since 2×161655761012546² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161655761012491 and 161655761012500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40413940253135 + ... + 40413940253138.

Almost surely, 2^{161655761012546} is an apocalyptic number.

161655761012546 is a deficient number, since it is larger than the sum of its proper divisors (80827880506276).

161655761012546 is an equidigital number, since it uses as much as digits as its factorization.

161655761012546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80827880506275.

The product of its (nonzero) digits is 9072000, while the sum is 56.

The spelling of 161655761012546 in words is "one hundred sixty-one trillion, six hundred fifty-five billion, seven hundred sixty-one million, twelve thousand, five hundred forty-six".