161554618955016 has 48 divisors (see below), whose sum is σ = 500050011052800. Its totient is φ = 46158462558432.

The previous prime is 161554618955011. The next prime is 161554618955047. The reversal of 161554618955016 is 610559816455161.

161554618955016 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 5 + 4 + 61 + 8 + 9 + 550 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (161554618955011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160272438936 + ... + 160272439943.

It is an arithmetic number, because the mean of its divisors is an integer number (10417708563600).

Almost surely, 2^{161554618955016} is an apocalyptic number.

It is an amenable number.

161554618955016 is an abundant number, since it is smaller than the sum of its proper divisors (338495392097784).

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

161554618955016 is a wasteful number, since it uses less digits than its factorization.

161554618955016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320544878898 (or 320544878891 counting only the distinct ones).

The product of its (nonzero) digits is 38880000, while the sum is 63.

The spelling of 161554618955016 in words is "one hundred sixty-one trillion, five hundred fifty-four billion, six hundred eighteen million, nine hundred fifty-five thousand, sixteen".