125500581261 has 24 divisors (see below), whose sum is σ = 209391346944. Its totient is φ = 71586783360.

The previous prime is 125500581229. The next prime is 125500581281. The reversal of 125500581261 is 162185005521.

125500581261 is a `hidden beast` number, since 1 + 2 + 5 + 50 + 0 + 581 + 26 + 1 = 666.

It is not a de Polignac number, because 125500581261 - 2⁵ = 125500581229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125500581281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37283101 + ... + 37286466.

It is an arithmetic number, because the mean of its divisors is an integer number (8724639456).

Almost surely, 2^125500581261 is an apocalyptic number.

125500581261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125500581261 is a deficient number, since it is larger than the sum of its proper divisors (83890765683).

125500581261 is a wasteful number, since it uses less digits than its factorization.

125500581261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74569601 (or 74569598 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

Adding to 125500581261 its reverse (162185005521), we get a palindrome (287685586782).

The spelling of 125500581261 in words is "one hundred twenty-five billion, five hundred million, five hundred eighty-one thousand, two hundred sixty-one".