161551615650500 has 24 divisors (see below), whose sum is σ = 352828728581784. Its totient is φ = 64620646260000.

The previous prime is 161551615650499. The next prime is 161551615650541. The reversal of 161551615650500 is 5056516155161.

161551615650500 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 14406564177604 + 147145051472896 = 3795598^2 + 12130336^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161551615151 + ... + 161551616150.

It is an arithmetic number, because the mean of its divisors is an integer number (14701197024241).

Almost surely, 2^{161551615650500} is an apocalyptic number.

161551615650500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161551615650500 is an abundant number, since it is smaller than the sum of its proper divisors (191277112931284).

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

161551615650500 is a wasteful number, since it uses less digits than its factorization.

161551615650500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323103231320 (or 323103231308 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 47.

The spelling of 161551615650500 in words is "one hundred sixty-one trillion, five hundred fifty-one billion, six hundred fifteen million, six hundred fifty thousand, five hundred".