161022411156420 has 144 divisors (see below), whose sum is σ = 533058815540160. Its totient is φ = 39019544198400.

The previous prime is 161022411156401. The next prime is 161022411156491. The reversal of 161022411156420 is 24651114220161.

161022411156420 is a `hidden beast` number, since 1 + 6 + 1 + 0 + 2 + 2 + 4 + 1 + 1 + 1 + 5 + 642 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 12091515 + ... + 21639074.

It is an arithmetic number, because the mean of its divisors is an integer number (3701797330140).

Almost surely, 2^{161022411156420} is an apocalyptic number.

161022411156420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161022411156420 is an abundant number, since it is smaller than the sum of its proper divisors (372036404383740).

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

161022411156420 is a wasteful number, since it uses less digits than its factorization.

161022411156420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33733026 (or 33733021 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

Adding to 161022411156420 its reverse (24651114220161), we get a palindrome (185673525376581).

The spelling of 161022411156420 in words is "one hundred sixty-one trillion, twenty-two billion, four hundred eleven million, one hundred fifty-six thousand, four hundred twenty".