125706645871 has 4 divisors (see below), whose sum is σ = 128078469432. Its totient is φ = 123334822312.

The previous prime is 125706645863. The next prime is 125706645881. The reversal of 125706645871 is 178546607521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178546607521 = 71 ⋅2514740951.

It is a cyclic number.

It is not a de Polignac number, because 125706645871 - 2³ = 125706645863 is a prime.

It is a super-3 number, since 3×125706645871³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125706645811) 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, 1185911701 + ... + 1185911806.

It is an arithmetic number, because the mean of its divisors is an integer number (32019617358).

Almost surely, 2^125706645871 is an apocalyptic number.

125706645871 is a deficient number, since it is larger than the sum of its proper divisors (2371823561).

125706645871 is an equidigital number, since it uses as much as digits as its factorization.

125706645871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371823560.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 125706645871 in words is "one hundred twenty-five billion, seven hundred six million, six hundred forty-five thousand, eight hundred seventy-one".