125261264989 has 4 divisors (see below), whose sum is σ = 143155731424. Its totient is φ = 107366798556.

The previous prime is 125261264981. The next prime is 125261264993. The reversal of 125261264989 is 989462162521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125261264989 - 2³ = 125261264981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125261264981) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8947233207 + ... + 8947233220.

It is an arithmetic number, because the mean of its divisors is an integer number (35788932856).

Almost surely, 2^125261264989 is an apocalyptic number.

It is an amenable number.

125261264989 is a deficient number, since it is larger than the sum of its proper divisors (17894466435).

125261264989 is an equidigital number, since it uses as much as digits as its factorization.

125261264989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17894466434.

The product of its digits is 3732480, while the sum is 55.

The spelling of 125261264989 in words is "one hundred twenty-five billion, two hundred sixty-one million, two hundred sixty-four thousand, nine hundred eighty-nine".