161104450644 has 36 divisors (see below), whose sum is σ = 407810696020. Its totient is φ = 53625732480.

The previous prime is 161104450621. The next prime is 161104450657. The reversal of 161104450644 is 446054401161.

161104450644 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 0 + 4 + 4 + 5 + 0 + 644 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7705328400 + 153399122244 = 87780^2 + 391662^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 161104450599 and 161104450608.

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, 3130417 + ... + 3181464.

Almost surely, 2^161104450644 is an apocalyptic number.

It is an amenable number.

161104450644 is an abundant number, since it is smaller than the sum of its proper divisors (246706245376).

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

161104450644 is a wasteful number, since it uses less digits than its factorization.

161104450644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6312600 (or 6312595 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 161104450644 in words is "one hundred sixty-one billion, one hundred four million, four hundred fifty thousand, six hundred forty-four".