161768862025 has 27 divisors (see below), whose sum is σ = 202022377311. Its totient is φ = 128499671040.

The previous prime is 161768862011. The next prime is 161768862053. The reversal of 161768862025 is 520268867161.

It is a happy number.

The square root of 161768862025 is 402205.

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

It can be written as a sum of positive squares in 13 ways, for example, as 110401359289 + 51367502736 = 332267^2 + 226644^2 .

It is not a de Polignac number, because 161768862025 - 2¹⁷ = 161768730953 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 516833269 + ... + 516833581.

Almost surely, 2^161768862025 is an apocalyptic number.

161768862025 is the 402205-th square number.

161768862025 is the 201103-rd centered octagonal number.

It is an amenable number.

161768862025 is a deficient number, since it is larger than the sum of its proper divisors (40253515286).

161768862025 is an frugal number, since it uses more digits than its factorization.

161768862025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 161768862025 in words is "one hundred sixty-one billion, seven hundred sixty-eight million, eight hundred sixty-two thousand, twenty-five".