161768057616 has 225 divisors, whose sum is σ = 499799687205. Its totient is φ = 48843653760.

The previous prime is 161768057551. The next prime is 161768057623. The reversal of 161768057616 is 616750867161.

The square root of 161768057616 is 402204.

It is a perfect power (a square), and thus also a powerful number.

161768057616 is a `hidden beast` number, since 1 + 6 + 1 + 7 + 68 + 0 + 576 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27882320400 + 133885737216 = 166980^2 + 365904^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 584000070 + ... + 584000346.

Almost surely, 2^161768057616 is an apocalyptic number.

161768057616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

161768057616 is the 402204-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161768057616

161768057616 is an abundant number, since it is smaller than the sum of its proper divisors (338031629589).

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

161768057616 is an frugal number, since it uses more digits than its factorization.

161768057616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 161768057616 in words is "one hundred sixty-one billion, seven hundred sixty-eight million, fifty-seven thousand, six hundred sixteen".