161884909455 has 8 divisors (see below), whose sum is σ = 259015855152. Its totient is φ = 86338618368.

The previous prime is 161884909447. The next prime is 161884909457. The reversal of 161884909455 is 554909488161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161884909455 - 2³ = 161884909447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161884909457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5396163634 + ... + 5396163663.

It is an arithmetic number, because the mean of its divisors is an integer number (32376981894).

Almost surely, 2^161884909455 is an apocalyptic number.

161884909455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161884909455 is a deficient number, since it is larger than the sum of its proper divisors (97130945697).

161884909455 is a wasteful number, since it uses less digits than its factorization.

161884909455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10792327305.

The product of its (nonzero) digits is 12441600, while the sum is 60.

The spelling of 161884909455 in words is "one hundred sixty-one billion, eight hundred eighty-four million, nine hundred nine thousand, four hundred fifty-five".