125535357813 has 4 divisors (see below), whose sum is σ = 167380477088. Its totient is φ = 83690238540.

The previous prime is 125535357809. The next prime is 125535357839. The reversal of 125535357813 is 318753535521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 318753535521 = 3 ⋅106251178507.

It is not a de Polignac number, because 125535357813 - 2² = 125535357809 is a prime.

It is a super-2 number, since 2×125535357813² (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 (125535356813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20922559633 + ... + 20922559638.

It is an arithmetic number, because the mean of its divisors is an integer number (41845119272).

Almost surely, 2^125535357813 is an apocalyptic number.

It is an amenable number.

125535357813 is a deficient number, since it is larger than the sum of its proper divisors (41845119275).

125535357813 is an equidigital number, since it uses as much as digits as its factorization.

125535357813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41845119274.

The product of its digits is 1890000, while the sum is 48.

The spelling of 125535357813 in words is "one hundred twenty-five billion, five hundred thirty-five million, three hundred fifty-seven thousand, eight hundred thirteen".