161866210276 has 9 divisors (see below), whose sum is σ = 283267276131. Its totient is φ = 80932702812.

The previous prime is 161866210273. The next prime is 161866210279. The reversal of 161866210276 is 672012668161.

The square root of 161866210276 is 402326.

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 (161866210273) and next prime (161866210279).

It is a super-2 number, since 2×161866210276² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161866210271) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 704071 + ... + 905233.

Almost surely, 2^161866210276 is an apocalyptic number.

161866210276 is the 402326-th square number.

It is an amenable number.

161866210276 is a deficient number, since it is larger than the sum of its proper divisors (121401065855).

161866210276 is an frugal number, since it uses more digits than its factorization.

161866210276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402330 (or 201165 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 161866210276 in words is "one hundred sixty-one billion, eight hundred sixty-six million, two hundred ten thousand, two hundred seventy-six".