161555516511516 has 36 divisors (see below), whose sum is σ = 432398588311872. Its totient is φ = 50684083611264.

The previous prime is 161555516511479. The next prime is 161555516511517. The reversal of 161555516511516 is 615115615555161.

161555516511516 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 5 + 5 + 51 + 65 + 11 + 516 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×161555516511516² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161555516511517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131989800460 + ... + 131989801683.

It is an arithmetic number, because the mean of its divisors is an integer number (12011071897552).

Almost surely, 2^{161555516511516} is an apocalyptic number.

It is an amenable number.

161555516511516 is an abundant number, since it is smaller than the sum of its proper divisors (270843071800356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161555516511516 is a wasteful number, since it uses less digits than its factorization.

161555516511516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263979602170 (or 263979602165 counting only the distinct ones).

The product of its digits is 3375000, while the sum is 54.

The spelling of 161555516511516 in words is "one hundred sixty-one trillion, five hundred fifty-five billion, five hundred sixteen million, five hundred eleven thousand, five hundred sixteen".