161668722 has 32 divisors (see below), whose sum is σ = 329314752. Its totient is φ = 52899264.

The previous prime is 161668721. The next prime is 161668723. The reversal of 161668722 is 227866161.

It is an interprime number because it is at equal distance from previous prime (161668721) and next prime (161668723).

It is a super-2 number, since 2×161668722² = 52273551346226568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161668721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159088 + ... + 160100.

It is an arithmetic number, because the mean of its divisors is an integer number (10291086).

Almost surely, 2^161668722 is an apocalyptic number.

161668722 is an abundant number, since it is smaller than the sum of its proper divisors (167646030).

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

161668722 is a wasteful number, since it uses less digits than its factorization.

161668722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482.

The product of its digits is 48384, while the sum is 39.

The square root of 161668722 is about 12714.9015725644. The cubic root of 161668722 is about 544.7643365706.

The spelling of 161668722 in words is "one hundred sixty-one million, six hundred sixty-eight thousand, seven hundred twenty-two".