125815356108609 has 8 divisors (see below), whose sum is σ = 167836486224960. Its totient is φ = 83835565032336.

The previous prime is 125815356108587. The next prime is 125815356108613. The reversal of 125815356108609 is 906801653518521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125815356108609 - 2¹² = 125815356104513 is a prime.

It is a super-2 number, since 2×125815356108609² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (125815356108649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10334752917 + ... + 10334765090.

It is an arithmetic number, because the mean of its divisors is an integer number (20979560778120).

Almost surely, 2^{125815356108609} is an apocalyptic number.

It is an amenable number.

125815356108609 is a deficient number, since it is larger than the sum of its proper divisors (42021130116351).

125815356108609 is a wasteful number, since it uses less digits than its factorization.

125815356108609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20669520039.

The product of its (nonzero) digits is 15552000, while the sum is 60.

The spelling of 125815356108609 in words is "one hundred twenty-five trillion, eight hundred fifteen billion, three hundred fifty-six million, one hundred eight thousand, six hundred nine".