161257883517056 has 16 divisors (see below), whose sum is σ = 321255939819390. Its totient is φ = 80628941758464.

The previous prime is 161257883517041. The next prime is 161257883517061. The reversal of 161257883517056 is 650715388752161.

It can be written as a sum of positive squares in only one way, i.e., 115730260840000 + 45527622677056 = 10757800^2 + 6747416^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 161257883516983 and 161257883517001.

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, 629913607361 + ... + 629913607616.

Almost surely, 2^{161257883517056} is an apocalyptic number.

161257883517056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161257883517056 is a deficient number, since it is larger than the sum of its proper divisors (159998056302334).

161257883517056 is an equidigital number, since it uses as much as digits as its factorization.

161257883517056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259827214991 (or 1259827214979 counting only the distinct ones).

The product of its (nonzero) digits is 84672000, while the sum is 65.

The spelling of 161257883517056 in words is "one hundred sixty-one trillion, two hundred fifty-seven billion, eight hundred eighty-three million, five hundred seventeen thousand, fifty-six".