125350682581 has 4 divisors (see below), whose sum is σ = 125512844652. Its totient is φ = 125188520512.

The previous prime is 125350682563. The next prime is 125350682609. The reversal of 125350682581 is 185286053521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185286053521 = 267299 ⋅693179.

It can be written as a sum of positive squares in 2 ways, for example, as 73571680081 + 51779002500 = 271241^2 + 227550^2 .

It is a cyclic number.

It is not a de Polignac number, because 125350682581 - 2¹³ = 125350674389 is a prime.

It is a super-2 number, since 2×125350682581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125350682531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81079876 + ... + 81081421.

It is an arithmetic number, because the mean of its divisors is an integer number (31378211163).

Almost surely, 2^125350682581 is an apocalyptic number.

It is an amenable number.

125350682581 is a deficient number, since it is larger than the sum of its proper divisors (162162071).

125350682581 is an equidigital number, since it uses as much as digits as its factorization.

125350682581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162162070.

The product of its (nonzero) digits is 576000, while the sum is 46.

The spelling of 125350682581 in words is "one hundred twenty-five billion, three hundred fifty million, six hundred eighty-two thousand, five hundred eighty-one".