161246554560 has 1344 divisors, whose sum is σ = 715742576640. Its totient is φ = 32407879680.

The previous prime is 161246554517. The next prime is 161246554583. The reversal of 161246554560 is 65455642161.

161246554560 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 46 + 5 + 545 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 723078609 + ... + 723078831.

It is an arithmetic number, because the mean of its divisors is an integer number (532546560).

Almost surely, 2^161246554560 is an apocalyptic number.

161246554560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161246554560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (357871288320).

161246554560 is an abundant number, since it is smaller than the sum of its proper divisors (554496022080).

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

161246554560 is a wasteful number, since it uses less digits than its factorization.

161246554560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

It can be divided in two parts, 161246 and 554560, that added together give a triangular number (715806 = T₁₁₉₆).

The spelling of 161246554560 in words is "one hundred sixty-one billion, two hundred forty-six million, five hundred fifty-four thousand, five hundred sixty".