125905392809281 has 8 divisors (see below), whose sum is σ = 131387319728640. Its totient is φ = 120424114173792.

The previous prime is 125905392809237. The next prime is 125905392809299. The reversal of 125905392809281 is 182908293509521.

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

It is a cyclic number.

It is not a de Polignac number, because 125905392809281 - 2²⁵ = 125905359254849 is a prime.

It is a super-2 number, since 2×125905392809281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125905392809081) 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, 161674065 + ... + 162450958.

It is an arithmetic number, because the mean of its divisors is an integer number (16423414966080).

Almost surely, 2^{125905392809281} is an apocalyptic number.

It is an amenable number.

125905392809281 is a deficient number, since it is larger than the sum of its proper divisors (5481926919359).

125905392809281 is a wasteful number, since it uses less digits than its factorization.

125905392809281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324141935.

The product of its (nonzero) digits is 27993600, while the sum is 64.

The spelling of 125905392809281 in words is "one hundred twenty-five trillion, nine hundred five billion, three hundred ninety-two million, eight hundred nine thousand, two hundred eighty-one".