67156131025 has 9 divisors (see below), whose sum is σ = 83275209201. Its totient is φ = 53723868240.

The previous prime is 67156131013. The next prime is 67156131043. The reversal of 67156131025 is 52013165176.

The square root of 67156131025 is 259145.

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 6454997649 + 60701133376 = 80343^2 + 246376^2 .

It is not a de Polignac number, because 67156131025 - 2²⁵ = 67122576593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1269811 + ... + 1321639.

Almost surely, 2^67156131025 is an apocalyptic number.

67156131025 is the 259145-th square number.

67156131025 is the 129573-rd centered octagonal number.

It is an amenable number.

67156131025 is a deficient number, since it is larger than the sum of its proper divisors (16119078176).

67156131025 is an frugal number, since it uses more digits than its factorization.

67156131025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103668 (or 51834 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 67156131025 in words is "sixty-seven billion, one hundred fifty-six million, one hundred thirty-one thousand, twenty-five".