161235534240 has 144 divisors (see below), whose sum is σ = 600235979616. Its totient is φ = 39087398400.

The previous prime is 161235534227. The next prime is 161235534253. The reversal of 161235534240 is 42435532161.

161235534240 is a `hidden beast` number, since 1 + 6 + 1 + 23 + 553 + 42 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (161235534227) and next prime (161235534253).

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a junction number, because it is equal to n+sod(n) for n = 161235534195 and 161235534204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5073666 + ... + 5105345.

It is an arithmetic number, because the mean of its divisors is an integer number (4168305414).

Almost surely, 2^161235534240 is an apocalyptic number.

161235534240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161235534240 is an abundant number, since it is smaller than the sum of its proper divisors (439000445376).

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

161235534240 is a wasteful number, since it uses less digits than its factorization.

161235534240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10179043 (or 10179032 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 161235534240 in words is "one hundred sixty-one billion, two hundred thirty-five million, five hundred thirty-four thousand, two hundred forty".