161001365550 has 24 divisors (see below), whose sum is σ = 399283386936. Its totient is φ = 42933697440.

The previous prime is 161001365549. The next prime is 161001365597. The reversal of 161001365550 is 55563100161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 536671069 + ... + 536671368.

It is an arithmetic number, because the mean of its divisors is an integer number (16636807789).

Almost surely, 2^161001365550 is an apocalyptic number.

161001365550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161001365550 is an abundant number, since it is smaller than the sum of its proper divisors (238282021386).

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

161001365550 is a wasteful number, since it uses less digits than its factorization.

161001365550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073342452 (or 1073342447 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 33.

The spelling of 161001365550 in words is "one hundred sixty-one billion, one million, three hundred sixty-five thousand, five hundred fifty".