161334640 has 40 divisors (see below), whose sum is σ = 376382160. Its totient is φ = 64313856.

The previous prime is 161334637. The next prime is 161334647. The reversal of 161334640 is 46433161.

161334640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 161334599 and 161334608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161334647) 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, 21276 + ... + 27844.

It is an arithmetic number, because the mean of its divisors is an integer number (9409554).

Almost surely, 2^161334640 is an apocalyptic number.

161334640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161334640 is an abundant number, since it is smaller than the sum of its proper divisors (215047520).

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

161334640 is a wasteful number, since it uses less digits than its factorization.

161334640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889 (or 6883 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 161334640 is about 12701.7573587280. The cubic root of 161334640 is about 544.3888331679.

The spelling of 161334640 in words is "one hundred sixty-one million, three hundred thirty-four thousand, six hundred forty".