164161640 has 16 divisors (see below), whose sum is σ = 369363780. Its totient is φ = 65664640.

The previous prime is 164161631. The next prime is 164161643. The reversal of 164161640 is 46161461.

It can be written as a sum of positive squares in 2 ways, for example, as 153908836 + 10252804 = 12406^2 + 3202^2 .

It is not an unprimeable number, because it can be changed into a prime (164161643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2051981 + ... + 2052060.

Almost surely, 2^164161640 is an apocalyptic number.

164161640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164161640 is an abundant number, since it is smaller than the sum of its proper divisors (205202140).

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

164161640 is a wasteful number, since it uses less digits than its factorization.

164161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104052 (or 4104048 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 164161640 is about 12812.5579023082. The cubic root of 164161640 is about 547.5501396225.

The spelling of 164161640 in words is "one hundred sixty-four million, one hundred sixty-one thousand, six hundred forty".