163778043025 has 27 divisors (see below), whose sum is σ = 210404563473. Its totient is φ = 126459093600.

The previous prime is 163778042969. The next prime is 163778043031. The reversal of 163778043025 is 520340877361.

It is a happy number.

The square root of 163778043025 is 404695.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2251217809 + 161526825216 = 47447^2 + 401904^2 .

It is not a de Polignac number, because 163778043025 - 2⁹ = 163778042513 is a prime.

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, 58679380 + ... + 58682170.

Almost surely, 2^163778043025 is an apocalyptic number.

163778043025 is the 404695-th square number.

163778043025 is the 202348-th centered octagonal number.

It is an amenable number.

163778043025 is a deficient number, since it is larger than the sum of its proper divisors (46626520448).

163778043025 is an frugal number, since it uses more digits than its factorization.

163778043025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650 (or 2825 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 163778043025 in words is "one hundred sixty-three billion, seven hundred seventy-eight million, forty-three thousand, twenty-five".