161396664 has 256 divisors, whose sum is σ = 514805760. Its totient is φ = 41472000.

The previous prime is 161396663. The next prime is 161396671. The reversal of 161396664 is 466693161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161396663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3936484 + ... + 3936524.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^161396664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161396664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257402880).

161396664 is an abundant number, since it is smaller than the sum of its proper divisors (353409096).

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

161396664 is a wasteful number, since it uses less digits than its factorization.

161396664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 138 counting only the distinct ones).

The product of its digits is 139968, while the sum is 42.

The square root of 161396664 is about 12704.1986760283. The cubic root of 161396664 is about 544.4585864190.

The spelling of 161396664 in words is "one hundred sixty-one million, three hundred ninety-six thousand, six hundred sixty-four".