161111856563280 has 240 divisors, whose sum is σ = 645543425701440. Its totient is φ = 36825567190272.

The previous prime is 161111856563279. The next prime is 161111856563299. The reversal of 161111856563280 is 82365658111161.

161111856563280 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 1 + 1 + 8 + 56 + 563 + 28 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 761004594 + ... + 761216273.

It is an arithmetic number, because the mean of its divisors is an integer number (2689764273756).

Almost surely, 2^{161111856563280} is an apocalyptic number.

161111856563280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161111856563280 is an abundant number, since it is smaller than the sum of its proper divisors (484431569138160).

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

161111856563280 is a wasteful number, since it uses less digits than its factorization.

161111856563280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522220903 (or 1522220884 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 161111856563280 in words is "one hundred sixty-one trillion, one hundred eleven billion, eight hundred fifty-six million, five hundred sixty-three thousand, two hundred eighty".