161618464 has 72 divisors (see below), whose sum is σ = 376624080. Its totient is φ = 68052096.

The previous prime is 161618461. The next prime is 161618491. The reversal of 161618464 is 464816161.

It is a super-2 number, since 2×161618464² = 52241055811438592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161618461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91639 + ... + 93385.

It is an arithmetic number, because the mean of its divisors is an integer number (5230890).

Almost surely, 2^161618464 is an apocalyptic number.

161618464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161618464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188312040).

161618464 is an abundant number, since it is smaller than the sum of its proper divisors (215005616).

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

161618464 is a wasteful number, since it uses less digits than its factorization.

161618464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830 (or 1815 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 161618464 is about 12712.9250764724. The cubic root of 161618464 is about 544.7078803738.

The spelling of 161618464 in words is "one hundred sixty-one million, six hundred eighteen thousand, four hundred sixty-four".