161350669640 has 32 divisors (see below), whose sum is σ = 363179247480. Its totient is φ = 64515336192.

The previous prime is 161350669639. The next prime is 161350669651. The reversal of 161350669640 is 46966053161.

161350669640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 121573558276 + 39777111364 = 348674^2 + 199442^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674099 + ... + 881538.

Almost surely, 2^161350669640 is an apocalyptic number.

161350669640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161350669640 is an abundant number, since it is smaller than the sum of its proper divisors (201828577840).

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

161350669640 is a wasteful number, since it uses less digits than its factorization.

161350669640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558241 (or 1558237 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 47.

The spelling of 161350669640 in words is "one hundred sixty-one billion, three hundred fifty million, six hundred sixty-nine thousand, six hundred forty".