161510226660 has 72 divisors (see below), whose sum is σ = 490708718136. Its totient is φ = 42999559680.

The previous prime is 161510226637. The next prime is 161510226677. The reversal of 161510226660 is 66622015161.

161510226660 is digitally balanced in base 2, because in such base 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 4998207204 + 156512019456 = 70698^2 + 395616^2 .

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

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 23 ways as a sum of consecutive naturals, for example, 616071 + ... + 838190.

It is an arithmetic number, because the mean of its divisors is an integer number (6815398863).

Almost surely, 2^161510226660 is an apocalyptic number.

161510226660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161510226660 is an abundant number, since it is smaller than the sum of its proper divisors (329198491476).

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

161510226660 is a wasteful number, since it uses less digits than its factorization.

161510226660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454893 (or 1454888 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 161510226660 in words is "one hundred sixty-one billion, five hundred ten million, two hundred twenty-six thousand, six hundred sixty".