125571663361 has 4 divisors (see below), whose sum is σ = 132958231812. Its totient is φ = 118185094912.

The previous prime is 125571663319. The next prime is 125571663379. The reversal of 125571663361 is 163366175521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163366175521 = 14759 ⋅11068919.

It can be written as a sum of positive squares in 2 ways, for example, as 42258613761 + 83313049600 = 205569^2 + 288640^2 .

It is a cyclic number.

It is not a de Polignac number, because 125571663361 - 2⁹ = 125571662849 is a prime.

It is a super-3 number, since 3×125571663361³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125571663661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3693284200 + ... + 3693284233.

It is an arithmetic number, because the mean of its divisors is an integer number (33239557953).

Almost surely, 2^125571663361 is an apocalyptic number.

It is an amenable number.

125571663361 is a deficient number, since it is larger than the sum of its proper divisors (7386568451).

125571663361 is an equidigital number, since it uses as much as digits as its factorization.

125571663361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7386568450.

The product of its digits is 680400, while the sum is 46.

The spelling of 125571663361 in words is "one hundred twenty-five billion, five hundred seventy-one million, six hundred sixty-three thousand, three hundred sixty-one".