125578805641 has 3 divisors (see below), whose sum is σ = 125579160013. Its totient is φ = 125578451270.

The previous prime is 125578805563. The next prime is 125578805657. The reversal of 125578805641 is 146508875521.

It is a happy number.

The square root of 125578805641 is 354371.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 146508875521 = 229 ⋅639776749.

It is not a de Polignac number, because 125578805641 - 2²¹ = 125576708489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125578895641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 177186 + ... + 531556.

Almost surely, 2^125578805641 is an apocalyptic number.

125578805641 is the 354371-st square number.

125578805641 is the 177186-th centered octagonal number.

It is an amenable number.

125578805641 is a deficient number, since it is larger than the sum of its proper divisors (354372).

125578805641 is an frugal number, since it uses more digits than its factorization.

125578805641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708742 (or 354371 counting only the distinct ones).

The product of its (nonzero) digits is 2688000, while the sum is 52.

The spelling of 125578805641 in words is "one hundred twenty-five billion, five hundred seventy-eight million, eight hundred five thousand, six hundred forty-one".