125865139787 has 4 divisors (see below), whose sum is σ = 125868462096. Its totient is φ = 125861817480.

The previous prime is 125865139753. The next prime is 125865139793. The reversal of 125865139787 is 787931568521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125865139787 - 2⁶ = 125865139723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125865139987) 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, 1603664 + ... + 1680317.

It is an arithmetic number, because the mean of its divisors is an integer number (31467115524).

Almost surely, 2^125865139787 is an apocalyptic number.

125865139787 is a deficient number, since it is larger than the sum of its proper divisors (3322309).

125865139787 is an equidigital number, since it uses as much as digits as its factorization.

125865139787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322308.

The product of its digits is 25401600, while the sum is 62.

The spelling of 125865139787 in words is "one hundred twenty-five billion, eight hundred sixty-five million, one hundred thirty-nine thousand, seven hundred eighty-seven".