40252798161 has 9 divisors (see below), whose sum is σ = 58143800091. Its totient is φ = 26834797512.

The previous prime is 40252798133. The next prime is 40252798171. The reversal of 40252798161 is 16189725204.

The square root of 40252798161 is 200631.

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

40252798161 is a `hidden beast` number, since 40 + 2 + 527 + 9 + 81 + 6 + 1 = 666.

40252798161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 634284225 + 39618513936 = 25185^2 + 199044^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 40252798161 - 2⁹ = 40252797649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40252798171) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 568455 + ... + 635331.

Almost surely, 2^40252798161 is an apocalyptic number.

40252798161 is the 200631-st square number.

40252798161 is the 100316-th centered octagonal number.

It is an amenable number.

40252798161 is a deficient number, since it is larger than the sum of its proper divisors (17891001930).

40252798161 is an frugal number, since it uses more digits than its factorization.

40252798161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133760 (or 66880 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 40252798161 in words is "forty billion, two hundred fifty-two million, seven hundred ninety-eight thousand, one hundred sixty-one".