161221046366 has 16 divisors (see below), whose sum is σ = 243782313984. Its totient is φ = 79960517784.

The previous prime is 161221046341. The next prime is 161221046369. The reversal of 161221046366 is 663640122161.

161221046366 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×161221046366³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161221046369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1334801 + ... + 1450563.

It is an arithmetic number, because the mean of its divisors is an integer number (15236394624).

Almost surely, 2^161221046366 is an apocalyptic number.

161221046366 is a deficient number, since it is larger than the sum of its proper divisors (82561267618).

161221046366 is a wasteful number, since it uses less digits than its factorization.

161221046366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121375.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 161221046366 in words is "one hundred sixty-one billion, two hundred twenty-one million, forty-six thousand, three hundred sixty-six".