161663340 has 24 divisors (see below), whose sum is σ = 452657520. Its totient is φ = 43110208.

The previous prime is 161663329. The next prime is 161663399. The reversal of 161663340 is 43366161.

It is a super-2 number, since 2×161663340² = 52270070999911200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 161663298 and 161663307.

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 7 ways as a sum of consecutive naturals, for example, 1347135 + ... + 1347254.

It is an arithmetic number, because the mean of its divisors is an integer number (18860730).

Almost surely, 2^161663340 is an apocalyptic number.

161663340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161663340 is an abundant number, since it is smaller than the sum of its proper divisors (290994180).

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

161663340 is a wasteful number, since it uses less digits than its factorization.

161663340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694401 (or 2694399 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 161663340 is about 12714.6899293691. The cubic root of 161663340 is about 544.7582913811.

The spelling of 161663340 in words is "one hundred sixty-one million, six hundred sixty-three thousand, three hundred forty".