87169610025 has 63 divisors (see below), whose sum is σ = 162135474631. Its totient is φ = 46490458680.

The previous prime is 87169609999. The next prime is 87169610027. The reversal of 87169610025 is 52001696178.

The square root of 87169610025 is 295245.

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

87169610025 is a `hidden beast` number, since 8 + 7 + 1 + 6 + 9 + 610 + 0 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 31381059609 + 55788550416 = 177147^2 + 236196^2 .

It is not a de Polignac number, because 87169610025 - 2¹⁹ = 87169085737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (87169610027) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 17433922003 + ... + 17433922007.

Almost surely, 2^87169610025 is an apocalyptic number.

87169610025 is the 295245-th square number.

87169610025 is the 147623-rd centered octagonal number.

It is an amenable number.

87169610025 is a deficient number, since it is larger than the sum of its proper divisors (74965864606).

87169610025 is an frugal number, since it uses more digits than its factorization.

87169610025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 8 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

It can be divided in two parts, 871696 and 10025, that added together give a square (881721 = 939²).

The spelling of 87169610025 in words is "eighty-seven billion, one hundred sixty-nine million, six hundred ten thousand, twenty-five".