161634405420 has 96 divisors (see below), whose sum is σ = 503137958400. Its totient is φ = 43078905792.

The previous prime is 161634405409. The next prime is 161634405431. The reversal of 161634405420 is 24504436161.

161634405420 is a `hidden beast` number, since 1 + 6 + 163 + 440 + 54 + 2 + 0 = 666.

161634405420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161634405409) and next prime (161634405431).

It is a super-2 number, since 2×161634405420² (a number of 23 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 916351 + ... + 1078409.

It is an arithmetic number, because the mean of its divisors is an integer number (5241020400).

Almost surely, 2^161634405420 is an apocalyptic number.

161634405420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161634405420 is an abundant number, since it is smaller than the sum of its proper divisors (341503552980).

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

161634405420 is a wasteful number, since it uses less digits than its factorization.

161634405420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163924 (or 163916 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 161634405420 in words is "one hundred sixty-one billion, six hundred thirty-four million, four hundred five thousand, four hundred twenty".