161938009570 has 16 divisors (see below), whose sum is σ = 291572700408. Its totient is φ = 64756474240.

The previous prime is 161938009567. The next prime is 161938009577. The reversal of 161938009570 is 75900839161.

161938009570 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 59010612241 + 102927397329 = 242921^2 + 320823^2 .

It is not an unprimeable number, because it can be changed into a prime (161938009577) by changing a digit.

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, 2304859 + ... + 2374078.

Almost surely, 2^161938009570 is an apocalyptic number.

161938009570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161938009570 is a deficient number, since it is larger than the sum of its proper divisors (129634690838).

161938009570 is a wasteful number, since it uses less digits than its factorization.

161938009570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682405.

The product of its (nonzero) digits is 408240, while the sum is 49.

The spelling of 161938009570 in words is "one hundred sixty-one billion, nine hundred thirty-eight million, nine thousand, five hundred seventy".