161696656 has 75 divisors (see below), whose sum is σ = 365879143. Its totient is φ = 69175040.

The previous prime is 161696653. The next prime is 161696659. The reversal of 161696656 is 656696161.

The square root of 161696656 is 12716.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (161696653) and next prime (161696659).

It can be written as a sum of positive squares in 2 ways, for example, as 50183056 + 111513600 = 7084^2 + 10560^2 .

It is a super-2 number, since 2×161696656² = 52291617123164672, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (349920) is a multiple of the sum of its prime divisors (30).

It is not an unprimeable number, because it can be changed into a prime (161696653) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 9511560 + ... + 9511576.

Almost surely, 2^161696656 is an apocalyptic number.

161696656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

161696656 is the 12716-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161696656

161696656 is an abundant number, since it is smaller than the sum of its proper divisors (204182487).

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

161696656 is an frugal number, since it uses more digits than its factorization.

161696656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 30 counting only the distinct ones).

The product of its digits is 349920, while the sum is 46.

The cubic root of 161696656 is about 544.7957105442.

The spelling of 161696656 in words is "one hundred sixty-one million, six hundred ninety-six thousand, six hundred fifty-six".